Is antivirus software really useful?

As a security experiance i say antivirus nothing to do because there company itself create virus and harm people computer so there antivirus get sell

But you can protect you computer without antivirus just by command Promt

Removing a Virus Without Using Any Anti-virus Software

1. Virus is a computer program that can copy itself and infect computers. ...
2. Run the command prompt by going to start and type cmd on the search programs and files. ...
3. Select the virus affected drive. ...
4. type attrib -s -h *.* /s /d then press enter. ...
5. type dir. ...
6. check if there is an unusual .exe file.