Free and open-source object-RDBMS featuring extensibility and SQL compliance. Also, ACID compliant, SQL compliant, and supports JSON and some other NoSQL features.
A popular cloud base RDBMS that works as client-server architecture where a client sends the request to a server and the server sends back the desired output.
PostgreSQL supports advanced data types (arrays, hstores, and user-defined data types, while MySQL only supports standard data types (numeric, strings, date, time).
PostgreSQL replication is synchronous where the master database is synchronized with the slave database, whereas MySQL replication is asynchronous (one-way).