To restore means to bring something back to its original condition or to return it to how it was before. When workers restore an old house, they repair damage, replace broken parts, and clean away years of wear until the house looks like it did when it was new. Museums restore ancient paintings by carefully removing dirt and fixing cracks so future generations can see them as the artist intended.

You can restore many different things. A computer technician might restore deleted files, bringing back information that seemed lost forever. A doctor helps restore a patient's health after an illness. A good night's sleep can restore your energy after an exhausting day. When a library restores a damaged book, they rebind the pages and repair the cover so readers can enjoy it again.

The word suggests returning something to a specific good state it was in before. You wouldn't say you're restoring a broken pencil by taping it together awkwardly. But if you carefully repaired a torn photograph so it looked whole again, that would be restoration. When something precious gets damaged or lost, restoration is the careful work of bringing it back.