You're now familiar with slave and dual master replications. You've seen their benefits as well. However, other very interesting features are available since MariaDB 10.
Most of these features are for advanced usages. However, they could be used in a more classical way to avoid manual data manipulations (like a multimaster slave solution).
The multimaster slave replication, also known as multisource replication, uses the GTID mechanism to provide this feature:
Here, for example, you have a master database with slaves for a CMS application. On the other hand, you've got a master and ...