Patch is a small piece of material used to mend a hole or a weak spot.
In computing, a patch is a set of changes to a computer program or its supporting data designed to update, fix, or improve it.
The term "patch" also refers to:
1. A small area differing from its surroundings
2. A temporary electrical connection
3. A piece of cloth sewn onto clothing as decoration
4. In medicine, a small piece of material containing drugs to be applied to the skin