Marvel Cinematic Universe or MCU works independently with Marvel Studios expanded to TV Shows( Agents of Shield,Daredevil,Jessica Jones, Agent Carter etc) ,short films and comics. So far they have established three phases in their development process.
The first movie released in MCU was Iron Man in 2008, followed by others
The Incredible Hulk, Iron Man 2, Thor, Captain America:The first Avenger and ended with The Avengers.
PHASE-2 After the successful response of PHASE-1 MCU was ready to jump into the next order of business. It was aimed to draw up a storyline for Avengers:Infinity Wars.The movies in this phase were
Iron Man 3,Thor 2:The Dark World, Captain America:Winter Soldier, Guardians of Galaxy, Avengers:Age of Ultron and Ended up with Ant-Man
PHASE-3 MCU with inception of this phase wants to establish a superhero franchise that will fetch Academy Awards not just in technical aspects but also for actors, supporting actors,ensemble cast etc.
The First Movie in this phase is Captain America:Civil War which will release on May 6,2016, other movies in this phase are
Doctor Strange:November 4,2016
Guardians of Galaxy vol. 2:May 5,2017
Spider Man: July 7,2017
Thor:Ragnarok:November 3, 2017
Black Panther: Feb 16, 2018
Avengers Infinity Wars Part-1: May 4,2018
Ant Man and the Wasp:July 6,2018
Captain Marvel:March 8,2019
Avengers:Infinity Wars Part 2:May 3,2019