---
title: "Bandwidth"
slug: bandwidth
date: 2026-05-27T11:45:29+00:00
modified: 2026-05-27T11:45:29+00:00
permalink: https://brightdata.com/glossary/bandwidth
type: page
---

# Bandwidth

**TLDR:** Bandwidth is the maximum amount of data a network connection can carry per second. More bandwidth means more data can flow simultaneously. It is a ceiling — not a guarantee of speed.

**Bandwidth** describes the capacity of a network link. It is measured in bits per second — kilobits (Kbps), megabits (Mbps), or gigabits (Gbps). Bandwidth is often confused with latency. Bandwidth is how wide the pipe is. Latency is how long a single packet takes to travel end-to-end. A high-bandwidth, high-latency link can still feel slow for interactive tasks.

## Bandwidth vs Throughput vs Latency

1. **Bandwidth**: The theoretical maximum data rate of a link. Set by physical infrastructure.
2. **Throughput**: The actual data rate achieved in practice. Always ≤ bandwidth, reduced by congestion and packet loss.
3. **Latency**: The time for a single packet to travel from source to destination. Independent of bandwidth.

## What Affects Bandwidth

1. **Physical Medium**: Fiber optic cables carry far more bandwidth than copper or wireless.
2. **Network Congestion**: Shared links slow when many users transmit simultaneously.
3. **Protocol Overhead**: [HTTP](/glossary/http) headers, TLS handshakes, and [network protocol](/glossary/network-protocol) overhead consume a portion of available bandwidth.
4. **ISP Throttling**: [ISPs](/glossary/isp) may intentionally limit bandwidth for specific traffic types or at peak hours.
5. **Distance**: Signal degradation over long distances reduces effective bandwidth on some media.

## Bandwidth in Proxy Networks and Data Collection

Web data collection transfers large volumes of [HTTP responses](/glossary/http-response) — HTML pages, JSON payloads, and binary assets. Bandwidth is a direct cost factor: most proxy and data services bill by the gigabyte transferred. Efficient scrapers minimize bandwidth usage by requesting only necessary resources — skipping images, fonts, and analytics scripts that are irrelevant to the target data. Bright Data’s [Web Scraper API](/products/web-scraper-api) and [residential proxy](/proxy-types/residential-proxies) network are engineered for high-throughput, bandwidth-efficient data collection at scale.

## Measuring Bandwidth

1. **Speed Tests**: Tools like Ookla Speedtest measure real-world download and upload bandwidth.
2. **Network Monitoring**: Tools like iftop, Wireshark, or cloud dashboards show per-connection bandwidth usage.
3. **API Billing Dashboards**: Proxy and cloud providers report bandwidth consumed per request or per day.

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