Yoshi is a fictional dinosaur who appears in video games published by Nintendo. Yoshi debuted in Super Mario World (1990) on the SNES as Mario and Luigi's sidekick. Throughout the mainline Super Mario series, Yoshi typically serves as Mario's trusted steed. With a gluttonous appetite, Yoshi can gobble enemies with his long tongue, and lay eggs that doubly function as projectiles. Yoshi is the title character of the Yoshi series and a supporting character in the Mario franchise. He has appeared in Mario Party and Mario Kart, as well as many Mario sports games. He also appears as a playable character in the crossover fighting game series Super Smash Bros. Yoshi is a member of the same-named species, which is distinguished for its wide range of colors.
Yoshi has been well-received, with some critics noting that he is one of the most recognizable characters and one of the best sidekicks in video games. Yoshi's image has also appeared on a range of products, including clothes and collectibles.
Source : Wikipedia