Encrypting a computer protects it if it is stolen, and gives peace of mind if it is lost.
Encryption is a very powerful way to protect information. It is also surprisingly easy to set up.
Encryption protects you if your computer is lost, stolen, or "borrowed".
Without encryption, if someone steals your computer, they can very easily read information by taking our the hard disk and attaching it to their own computer. Then they have full access to all of your files.
Encryption also protects information if your laptop breaks. Even though you cannot delete all its sensitive files, at least they are safely encrypted.