Computer surveillance is when someone or something is watching what you are doing on your computer. It's like having a camera that is looking over your shoulder while you are using your computer. People or companies can use special software to see what websites you visit, or what words you type into a search engine. They can even see what you write in an email or what messages you send in a chatroom. This can be dangerous because it means that someone can spy on you without your knowledge. To protect yourself from computer surveillance, use strong passwords and don't give out personal information online.