It now forms part of a broader feature called System Protection, which makes it even harder to find. Strangely, considering how useful System Restore is, Windows 10 tucks the tool away in the System Properties section of the Control Panel, and doesn't even turn it on by default.
It's also possible to create restore points yourself.
System Restore used to create restore points automatically once a week, but in Windows 10 an instance is only created when a significant event occurs on your PC, such as an update, program, driver installation, or a system setting being changed. Introduced in Windows Me back in 2000, System Restore works by creating 'restore points' that let you revert a misbehaving computer - including its system files and settings, installed programs, and the Windows registry - to a previous point in time when it was working properly.