Who is Leonard Hofstadter?

Leonard Hofstadter is a fictional character from the television show "The Big Bang Theory," portrayed by Johnny Galecki. He is a physicist with a focus on experimental physics and is characterized by his nerdy demeanor, romantic relationship with Penny, and close friendships with other scientists. Leonard is known for his intelligence, kind heart, and sometimes neurotic behavior, providing a relatable perspective in the show's comedic exploration of geek culture.