Conflict-free Replicated Data Types (CRDTs) are used in systems with optimistic replication, where they take care of conflict resolution page 
>CRDTs ensure that, no matter what data modifications are made on different replicas, the data can always be merged into a consistent state. This merge is performed automatically by the CRDT, without requiring any special conflict resolution code or user intervention.
Moreover, an important characteristic of CRDTs is that they support decentralised operation:
>they do not assume the use of a single server, so they can be used in peer-to-peer networks and other decentralised settings. In this regard CRDTs differ from the algorithms used by Google Docs, Trello, and Figma, which require all communication between users to flow via a server.