Postgresql

I know mostly people make use of the mysql. And that has been the standard among most coders. but what about Postgresql? Do people find it useful? And also for restriction-less use of the database unlike mysql which is kind of limited in mysql.

Do you use Postgresql? What's your opinion about it?

I work a lot with server-side coding, but honestly I never used Postgresql - I still think MySQL is the best and most efficient solution at the moment