A hacker is someone who uses their computer skills to gain unauthorised access to computer systems or networks. Hackers may do this for a variety of reasons, such as stealing sensitive information, causing damage to computer systems, or for financial gain.

Some hackers use their skills for ethical purposes, such as testing the security of computer systems to identify weaknesses and improve security.

It's important to protect your computer and network from hackers by using strong passwords, installing anti-virus software and being cautious when opening emails or downloading files from unknown sources. If you suspect that your computer or network has been hacked, it's important to seek help and take steps to secure your system.