What superhero does Paul Rudd play in a 2015 movie?

Sassy, he can shrink to the size of an ant and communicate with ants. He's been around in the comics for a long time. Rudd does a great job, playing with just enough tongue-in-cheek to make the character fun. He's become one of my favorite MCU characters.

Come on, Antman?!? They have made so many of these childish superhero movies, they must have run out of ideas...What is next? Micro Bacteria Man?

I would like to know more about this antman is he part man and part ant?