--- title: "TCP vs UDP: What's the Difference?" slug: tcp-vs-udp date: 2025-03-25T13:14:27+00:00 modified: 2026-04-20T11:23:21+00:00 permalink: https://brightdata.com/blog/proxy-101/tcp-vs-udp type: blog --- [ Blog ](https://brightdata.com/blog "Blog") / [Proxy 101](https://brightdata.com/blog/proxy-101) [Proxy 101](https://brightdata.com/blog/proxy-101) # TCP vs UDP: What’s the Difference? Discover how TCP and UDP transport data across the web, their key differences, and which protocol is best for your needs. 7 min read [ ](https://brightdata.com/blog/authors/jake-nulty) [Jake Nulty Technical Writer ](https://brightdata.com/blog/authors/jake-nulty) ![TCP vs. UDP Comparison blog image](https://media.brightdata.com/2025/03/TCP-vs.-UDP-Comparison.svg) TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are the two most common ways of transporting data across the modern web. You might not know it, but you use them both just about every day. Read on to find out how! ## Why Can’t the Server Just Send All My Data At Once? When you visit a website, or view a live stream, it might seem like you’re getting all your data simultaneously. In reality, this couldn’t be further from the truth. The internet doesn’t work like that– and there’s a good reason for it. To avoid overwhelming our networks, our data gets broken into chunks. Imagine you have a 500mbps connection, and you’re downloading a 100GB video game. Without chunking, your router would fail to process the data and your network would slow to a crawl–effectively crashing it! Different protocols like TCP and UDP are used to define how these chunks are transmitted. - **TCP**: Chunks are sent and verified in succession. Think of this almost like mail correspondence. Your machine receives a letter, reads it, and then asks for the next one. - **UDP**: All chunks are sent in rapid-fire–like a .50 caliber data turret! ## Transmission Control Protocol TCP is at the heart of all your HTTP/HTTPS requests. TCP cares about all the details of our connection. With TCP, we initiate a handshake and then our response comes back in order. Every time our client receives a response, it sends an ACK (acknowledgement) to the server. This way, the server always knows the state of the information it delivered. Let’s pretend you’re downloading a file over TCP and it gets split into 4 chunks, or **segments**. The server sends our first chunk, and our HTTP client tells it everything went OK. Then, we repeat that process with chunks 2, 3 and 4. We suggest you learn more about [making HTTP requests](/blog/web-data/python-requests-guide). ### Core Functionality Here’s the step by step of how TCP works. 1. The Client (your smartphone) initiates a handshake and requests your email history from the server. 2. The history is too large to send all at once, so it splits your history into chunks (with TCP, these chunks are called segments). 3. The server sends the first chunk. 4. Your phone sends an ACK (acknowledgement) that the first chunk was received. 5. The server sends the second chunk. 6. Your phone sends another ACK. This process repeats on a loop until all of the data has been transferred. ### Applications Wherever data needs to be accurate, TCP is there running things under the hood. You use TCP in all the following applications. - **Web Browsing**: HTTP/HTTPS (HyperText Transfer Protocol)/(HyperText Transfer Protocol Secure) uses TCP to send pages to your browser. - **Email**: SMTP (Simple Mail Transfer Protocol), IMAP (Internet Message Access Protocol), and POP3 (Post Office Protocol version 3) all use TCP to ensure that your messages arrive in order–not random, jumbled gibberish. - **Large File Downloads**: FTP (File Transfer Protocol) and SFTP (Secure File Transfer Protocol) ensure that large downloads occur in an orderly fashion without corrupting your data. ### Pros and Cons **Pros** - ✅ Reliable: TCP ensures that all data gets delivered. - ✅ Error-free: If a chunk gets sent or processed incorrectly, TCP makes sure to retransmit the data. **Cons** - ❌ Slow: Due to its strict accuracy rules, TCP is often slow. - ❌ Network Congestion: In heavy traffic, TCP gets bogged down while waiting for everything to align perfectly. ## User Datagram Protocol UDP is kind of like TCP’s laidback cousin. TCP is all about handshakes and maintaining a connection until the data arrives perfectly. Our UDP chunks are technically called **datagrams**. With UDP, we send a single request and the server sends all the chunks in rapid succession without verifying their accuracy. When processing responses, there is no ACK system or handshake. Your machine sends a single request and receives its data. The server hears this request and responds by firing off all of these chunks with no particular order. ### Core Functionality The process in UDP is much more fast and loose. 1. Your machine requests the data 2. The server sends each chunk in rapid-fire with no verification or ACKs. **Your data arrives as fast as possible and usually out of order. The server doesn’t care about missing chunks or data integrity.** ### Applications - **Live Streaming**: When you watch a YouTube livestream, the app on your phone or TV sends the requests and opens up the stream. Then the data starts flying! - **Online Games**: With modern online games, we deal with KB (kilobytes) and sometimes even MB (megabytes) in just a few seconds. UDP gets the game rendered on your screen with minimal latency. - **DNS (Domain Name System) Lookups**: When you came here to the [Bright Data Blog](/blog), a DNS server used UDP shoot the IP address right into your browser. ### Pros and Cons **Pros** - ✅ Blazing fast: UDP doesn’t care about accuracy, it’s like a machine gun firing off all its data as fast as possible. - ✅ Lean: There are no resources wasted on handshakes and ACKs–just all the data coming as fast as possible. **Cons** - ❌ Unreliable: Data can arrive jumbled or sometimes not at all. - ❌ Hands-off: UDP servers don’t care that your livestream isn’t working. They just keep sending more data. ## Common Misconceptions ### Misconception #1: TCP is Always Slower Than UDP Yes, TCP adds a delay through handshakes and ACKs. However, modern protocols like TCP Fast Open (TFO) and Multipath TCP (MPTCP) are reducing TCP latency and improving performance. While UDP is almost always faster, fine-tuned TCP can sometimes outperform even UDP. ### Misconception #2: UDP is Only for Streaming & Gaming Real-time applications are the primary niche for UDP, however this isn’t just limited to live streams and online gaming. Low-latency trading, sensor technologies and even DNS can utilize UDP. ### Misconception #3: You Can Only Use One Modern technologies actually utilize both TCP and UDP. When you watch TV through Hulu or YouTube, your actual setup like initial connection, metadata, and buffering are often sent using TCP. While streaming this content, UDP is often used for adaptive bitrate and reduced lag during the stream. ## When To Use Each One Use CaseRecommended ProtocolReliabilitySpeedGuarantees Order?Requires Handshake?Tolerates Packet LossWhy It FitsWeb Browsing (HTTP/HTTPS)TCP✔️❌ Slower✔️✔️❌Ensures full page loads in correct orderEmail (SMTP, IMAP, POP3)TCP✔️❌ Slower✔️✔️❌Messages must be delivered completely and accuratelyFile Downloads (FTP/SFTP)TCP✔️❌ Slower✔️✔️❌Prevents data corruption in large transfersVideo Calls / VoIPUDP❌✔️ Fast❌❌✔️Prioritizes real-time communication over accuracyOnline GamingUDP❌✔️ Fast❌❌✔️Quick response time is more important than missing a frameLive StreamingUDP❌✔️ Fast❌❌✔️Buffering is avoided by dropping missing packetsDNS QueriesUDP❌✔️ Fast❌❌✔️Lightweight requests don’t need full connection handling## Conclusion: Choose The Right Tool For The Right Job Both TCP and UDP play a crucial role in how data moves across the internet. TCP ensures reliability and accuracy, making it ideal for web browsing, emails, and file transfers. On the other hand, UDP prioritizes speed, making it the go-to choice for live streaming, online gaming, and real-time communications. When it comes to proxies, the right protocol can make all the difference. If you need stable, reliable connections for web scraping, data collection, or secure browsing, [HTTP/HTTPS proxies](/solutions/https-proxies) using TCP are your best bet. But if speed and low latency are your priority, such as for streaming or gaming, [SOCKS5 proxies](/solutions/socks5-proxies) with UDP support can provide the performance you need. Take a look at the selection of proxy services below: - [Residential Proxies](/proxy-types/residential-proxies): Access the web through a real consumer device on a home internet connection. - [Datacenter Proxies](/proxy-types/datacenter-proxies): Route your requests some of the best hardware and bandwidth available in modern datacenters. - [ISP Proxies](/proxy-types/isp-proxies): Run your traffic through a specific internet service provider. - [Web Unlocker](/products/web-unlocker): Automatically connect to the best available proxy for your target site. No CAPTCHAs, no hassle. Sign up for a free trial and get started today![](#Why-Cant-the-Server-Just-Send-All-My-Data-At-Once) Start free trial[Start free with Google](# "Start free with Google") [ ](https://www.linkedin.com/in/jacob-nulty-682803187/) Jake Nulty Technical Writer 6 years experience Jacob Nulty is a Detroit-based software developer and technical writer exploring AI and human philosophy, with experience in Python, Rust, and blockchain. Expertise Data Structures Python Rust [ View all articles ](https://brightdata.com/blog/authors/jake-nulty) Table of Contents 400M+ Residential Proxies **Get 50% off** on residential proxies for 6 months! Use code **RESIGB50**. [See pricing](/pricing/proxy-network/residential-proxies "See pricing") 1.3M+ Datacenter Proxies Pay only for the IP, starting from $0.90. [See pricing](/pricing/proxy-network/datacenter-proxies "See pricing") [ ](https://news.ycombinator.com/submitlink?t=TCP+vs+UDP%3A+What%26%238217%3Bs+the+Difference%3F&u=https://brightdata.com/blog/proxy-101/tcp-vs-udp) [ ](https://www.linkedin.com/shareArticle?mini=true&title=TCP+vs+UDP%3A+What%26%238217%3Bs+the+Difference%3F&url=https://brightdata.com/blog/proxy-101/tcp-vs-udp) [ ](http://www.reddit.com/submit?title=TCP+vs+UDP%3A+What%26%238217%3Bs+the+Difference%3F&url=https://brightdata.com/blog/proxy-101/tcp-vs-udp) ## You might also be interested in [ ](https://brightdata.com/blog/ai/openhuman-with-bright-data "Production-Ready Web Access in OpenHuman Through the Bright Data CLI") [AI Antonello Zanini Technical Writer ### Production-Ready Web Access in OpenHuman Through the Bright Data CLI Integrate Bright Data CLI with OpenHuman to enable production-ready web access and data collection for AI agents. 09-Sep-2026 12 min read ](https://brightdata.com/blog/ai/openhuman-with-bright-data) [ ](https://brightdata.com/blog/ai/minimax-m3-with-bright-data "Giving self-hosted MiniMax M3 agents live web access with Bright Data") [AI Satyam Tripathi Technical Writer ### Giving self-hosted MiniMax M3 agents live web access with Bright Data Self-hosted MiniMax M3 agents get live web access using Bright Data’s search and scraping tools. 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