Hello mehmetavnicelik,
Prolog is still being used — just not as extensively as some of the most commonly used languages in our industry, and there is a very good reason for that.
It is definitely a different way of working, but you might learn (if you delve deep enough into Prolog) that it makes solving some problems really easy.
With Prolog, you start by defining the desired state of your world, also known as a Predicate (a fact), and then ask Prolog to try to achieve that state.
Thanks.