It is a collection of JavaScript based technologies used to develop web applications. MEAN stands for MongoDB , ExpressJS , AngularJS , NodeJS .  As the name suggests , the last three technologies are javascript based technologies , but the interesting part is the DataBase also is a javascript technology . In a nutshell , now you can develop web apps or do full stack development just in one language , either it be client side or server side , javascript takes care of all !!!  Isn’t it cool !! , lets have a look at these technologies in detail