Splits specify the royalties structure that should be used when a Meem is sold. Any number of addresses can be set to receive a payout.
Meem also aims to be maximally compatible with existing and emerging standards. Splits are currently compatible with Rarible Royalties V2 (https://docs.rarible.org/ethereum/smart-contracts/royalties/).
When implemented properly by a marketplace, sales should pay out royalties based on the splits.