It is the story of 2 nerdy roommates( Leonard and Sheldon) , their friends( Raj and Howard) and the hot neighbour ( penny) who just moved in to their apartment nextdoor.it is filled with scientific puns and jokes.jim Parsons is impeccable portraying the role of Sheldon Cooper a difficult roommate with an iq of 180 but no emotional maturity.along the season two more important charaters Amy and Bernadette who play the romantic interest of Sheldon and Howard.The series is created by Chuck Lorre .