It is malicious software that can encrypt your files and make them inaccessible. You will require to pay to the hacker to restore your access to these files.
Avast Ransomware Shield helps to secure all your photos, documents, and other files from being affected by ransomware attacks. This feature scans your system automatically and secures your personal data from potentially harmful applications. You can even specify which applications should modify your files and which applications should not.