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Pikachu (ピカチュウ Pikachu) is an Electric-type Pokémon and the mascot, so it is popularly called, of the Pokémon franchise.
It evolves from Pichu by happiness, and evolves into Raichu when exposed to a Thunderstone.
It is the version mascot of Pokémon Yellow, where it is the only starter Pokémon in that game, and has made numerous appearences on the boxes of spin-off titles.
Pikachu has physical aspects resembling several species of rodents, such as mice.
Pikachu is a combination of ぴかぴか pikapika which is Japanese onomatopoeia for sparkle and ちゅうちゅう chūchū which is the sound of squeaking. It may be named after the pika, a lagomorph, but this is less likely. "Pika" also means "quick" in Finnish.