"The Big Bang Theory" is a popular American sitcom that revolves around the lives of a group of socially awkward but brilliant scientists and their interactions with each other and the world around them. The show primarily focuses on physicists Leonard Hofstadter and Sheldon Cooper, whose lives are turned upside down when a charming aspiring actress, Penny, moves in next door. Alongside their equally nerdy friends Howard Wolowitz and Rajesh Koothrappali, they navigate the complexities of friendship, romance, and pop culture references, resulting in a blend of humor, intellect, and heartwarming moments throughout the series.