SpellsCharm
Reparo
The Mending Charm repairs broken objects. Hermione uses it to mend the broken window of a railway carriage after the Dementors search the Hogwarts Express. Harry eventually uses the Elder Wand to repair his own wand.
In the books
Harry Potter and the Goblet of FireChapter: 11
Hermione repairs the train compartment’s broken glass after Ron slams the door.