Metatransaction

A metatransaction is like a butler that executes a transaction signed by another party on behalf of the original signer, ferrying this original transaction onto the public blockchain rather than the person having to do it themselves. Thus, metatransactions remove the complexities and gas cost of execution on public blockchains by letting a relayer network handle these while the user just needs to sign the transaction with one click.

Sources:

https://coinmarketcap.com/alexandria/glossary/metatransaction