Pinning in IPFS allows you to tell IPFS to keep a particular object in its storage. Usually, an IPFS client only keeps files cached for a specific time after they've been accessed, after which they get deleted during garbage collection unless those files are pinned.
Would you like to free up some space on your Infura IPFS? By unpinning files, the garbage collector will remove those files, freeing up some of your Infura IPFS storage.
Unpinning With Infura
Take a look at the following articles to learn more about unpinning objects on Infura's IPFS service: