A keylogger is a program that registers user actions on a computer and logs the following dаta: the time of the session on the computer, the time of launching and closing individual programs, which documents and when were opened, the addresses of visited websites, which files were downloaded from the Internet, all keys pressed (i.e. all passwords, codes and logins). Then this log is automatically sent to the specified email address. A hacker can install this program during the user's absence on his computer, if the user has not logged out or has not password-protected the screensaver program. Or a hacker can send you a keylogger as an attachment to a regular email, and you can launch it by inadvertently clicking on the link. The person who installed a computer spy for you will know almost everything about you, while remaining anonymous. It is not so easy to find and get rid of keyloggers, and in some cases even advanced antivirus programs cannot help with this. An effective means of protection is the use of firewalls, which allows you to restrict access to the Internet of programs installed in the system. There are also special programs that monitor the integrity of computer system files. In any case, if you suspect that a keylogger may be installed on your computer, it is better to contact a specialist.