MySQL Replication is a process where data from one MySQL database known as the source (formerly called “master”) is copied over to one or more other databases called replicas (formerly called “slaves”). Think of this like having a backup buddy that is always in sync and up to date, giving you peace of mind.
It’s important to highlight that in 2020, MySQL took the step to modernize its language by retiring outdated terms such as ‘master’ and ‘slave’ and replacing them with more inclusive language – ‘source’ and ‘replica’. The company is actively working towards updating its queries and documentation