Barney the Dinosaur is a friendly, purple Tyrannosaurus rex who is the main character in the children's television series "Barney & Friends." The show first aired in 1992 and is designed to teach preschoolers about various topics, including friendship, sharing, and creativity through songs and interactive play. Barney is known for his cheerful personality and his catchphrase, "I love you." Barney is often accompanied by a group of children and other characters, such as Baby Bop and BJ. The show features colorful sets and engaging music, making learning fun for young viewers. Barney's positive messages and entertaining format have made him a beloved figure in children's entertainment.