Have you worked with replication? What types of replication exist?

Yes, I have worked with data replication. Replication is the process of copying and synchronizing data between multiple servers or databases to improve availability, fault tolerance, and scalability.

Main types of replication:

• Master-Slave — one server (master) accepts writes, while others (slaves) only read data. Updates go through the master.
• Master-Master — multiple servers can accept writes and synchronize changes among themselves. More complex to implement due to conflicts.
• Asynchronous replication — changes on the master are not immediately reflected on the slaves, there can be a delay.
• Synchronous replication — a write is considered successful only after all replicas confirm, ensuring consistency but reducing performance.

In Go, third-party solutions or databases with built-in replication support are often used, such as PostgreSQL, MongoDB, or custom mechanisms using channels and goroutines for data synchronization.