Drivers help your hardware work smoothly with everything else it interacts with in your computer. There are few main reasons why an update would be released:
1. Updates which improve performance or add a feature
2. Updates which correct previous bugs that were unintentionally introduced (ex. your printer manufacturer releases and update to add a feature and unintentionally breaks something else).
3. Updates which fix issues that other have introduced unintentionally (ex. Microsoft releases an update for Windows which causes your printer driver to no longer work correctly. They are happy with their update so now your printer manufacturer has to issue an update to get your printer working again).
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