There are two types of the virus.
The first type reduces access to your computer, meaning you can’t use your computer properly. Either locks your screen, or locks your WiFi, or loses any other program you need.
The second type locks your files. People who work in agencies destroy and lock their Word, Excel and other files which then forces you to send a bitcoin or ethereum to the hacker (internet money).
To avoid these viruses you should always use updated antivirus such as Kaspersky or AVG.
(Other types of antivirus are also available on the Internet.)
If your files are locked, without you sending money to hackers, you can now use Ransome Decryption Tools to help you avoid this hassle.
I will share these programs with you in other posts.