Malware

Malware are malicious programs or software designed to:

• steal your data or passwords, e.g. tracking what you type, posing as another application.
• access your device and use it for other purposes, e.g. bitcoin mining.

Watch out for suspicious emails or websites.

Avoid clicking on links or downloading software from untrusted sources. 

Usually "free" software that is too good to be true can introduce a computer virus or malware to your device.