Well you have software patches, sewing patches, tire patches, patches of dirt in your yard, digital patches, brownie patches, scouting patches, dry patchy skin, and all sorts of other uses for the word patch. Which one are you wanting to know about? (I suspect your asking about patches here on the site. In which case the answers below cover it for you. Its best if you can be a little more specific with your questions.)
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I'd forgotten all about patches. they were flying about all over the place when they first appeared but no so much lately, that I've seen.(Check your mail to see an example #;¬)
A digital sign of appreciation.Where, in real life, you might give a round of applause, buy a drink or send a card, here you send a patch.
Some of these might answer your question.