In plain English
Think of bandwidth as how wide the pipe is. A wider pipe moves more data at once, so more people can stream, call and download at the same time without slowing each other down.
Example
A family on a 50 Mbps connection notices video calls stutter when someone starts a 4K stream. Upgrading to 500 Mbps gives everyone enough room at once.
Not the everyday meaning
The time or energy to take on something new.
Why it matters
Bandwidth decides how much traffic an app, office or website can handle at once. Cloud providers often charge for data moving in and out, so heavy video or large downloads show up on the bill. It's also why people say "I don't have the bandwidth" in meetings: the phrase was borrowed from tech.
Common confusion
Bandwidth vs. latency. Bandwidth is how much data can move at once. Latency is how long one trip takes. A connection can have huge bandwidth and still feel slow if latency is high.