Ngrep

Ngrep is like a special kind of computer tool that can help grown-ups understand what's going on between two computers when they're talking to each other.

It works by listening to all the conversation (also called network traffic) that's flowing between the computers - the same way you might listen in on a secret conversation between your friends. It then uses very special, grown-up computer magic (something called "regular expressions" - don't worry about what that means) to find certain words or phrases that you tell it to look for.

For example, imagine you wanted to know if anyone was using the word "cat" in an online chat. You could ask ngrep to listen in to the chat traffic and tell you if it finds any messages with the word "cat" inside.

It's a really helpful tool for grown-ups who want to keep an eye on what's happening on their computer networks, but it can be quite tricky to use so it's not something you need to worry about as a young child.