A rollback restores a device to the driver package it used before the most recent change, using a previous package Windows kept in the driver store. Device Manager offers it as Roll Back Driver.
In practice
After a graphics package update, someone notices a display issue that was not there before. If Windows kept the previous package, Roll Back Driver on the Driver tab reinstates it, possibly asking for a restart afterward.
Common confusion
A rollback is not a system restore; it affects only the selected device's driver. It is also not always available: the button greys out when no previous package exists. And it reverses one change rather than guaranteeing any particular outcome.
Why it matters to readers
Knowing rollback exists makes driver changes less daunting, but its limits are worth remembering. When it is unavailable, the device maker's reference site is the source for earlier releases.
A closer look
Windows keeps only the immediately previous package for rollback purposes, not a full history. After a rollback, the button may become unavailable until another change occurs. Windows Update may also offer the newer package again later, and how it treats a rolled-back package varies by situation, so checking the optional updates list after a while is a sensible habit.
