System Restore is a Windows recovery tool that allows the reversal of changes made to the operating system. This reversal affects installed programs, Windows updates, system files, drivers, and registry keys; it will not, however, remove viruses or affect personal files.
If you're not seeing any restore points, it might mean system protection is disabled. To check, go to the Control Panel and search "Recovery", then navigate to "Recovery" > "Configure System Restore" > "Configure" and select "Turn on system protection".