Bandwidth
Also known as: network bandwidth, what is bandwidth, connection speed
Bandwidth is the maximum rate at which data can move over a connection, measured in bits per second (Mbps or Gbps). Higher bandwidth means files transfer faster, but it does not change how much storage those files use once saved.
- A data rate (Mbps/Gbps), not a quantity
- Higher bandwidth = faster transfers, same file size
- Distinct from a monthly data cap
Bandwidth vs data used
Bandwidth is a speed, not an amount. It describes how fast data can flow — for example, 100 Mbps — while the total data you transfer is measured in megabytes or gigabytes. A bigger pipe moves the same file faster but the file’s size on disk is unchanged.
People often confuse bandwidth with a monthly data cap. The cap limits how much you can transfer; bandwidth limits how quickly. Streaming, large downloads, and cloud backups all consume both — they take bandwidth while running and count against a data cap.
Why it matters for transfers and backups
Backing up photos or syncing files to the cloud is bound by your upload bandwidth, which is usually the slower direction. A large camera roll can take hours to back up on a slow uplink even though it occupies the same space locally.
On a metered or cellular plan, large transfers also burn through your data allowance, so apps often defer big uploads to Wi-Fi.