The Tamagotchi (たまごっち?) [ta̠ma̠ɡ̃o̞t͡ɕːi̥] is a handheld digital pet, created in Japan by Akihiro Yokoi of WiZ and Aki Maita of Bandai. It was released by Bandai on November 23, 1996 in Japan and May 1997 in the rest of the world, quickly becoming one of the biggest toy fads of the 1990s and early 2000s. As of 2010, over 76 million Tamagotchis have been sold world-wide. Most Tamagotchi are housed in a small egg-shaped computer with an interface usually consisting of three buttons, although the number of buttons may vary.
According to Bandai, the name is a portmanteau combining the Japanese word tamago (?), which means "egg", and the English word "watch". Consequently, the name is sometimes romanized as "Tamagotch" without the "i" in Japan. Most Tamagotchi characters' names end in tchi (っち?) in Japanese, with few exceptions.
Tamagotchi was invented by Aki Maita for which she won the 1997 Ig Nobel Prize for economics. Tamagotchi is a keychain-sized virtual pet simulation game. The characters are colorful and simplistically designed creatures based on animals, objects, or people. Beginning with the 2004 Tamagotchi Plus/Connection, a second wave of Tamagotchi toys emerged, featuring a different graphic design by JINCO and gameplay which elaborated upon the first generations. However, the story behind the games remained the same: Tamagotchis are a small alien species that deposited an egg on Earth to see what life was like, and it is up to the player to raise the egg into an adult creature. The creature goes through several stages of growth, and will develop differently depending on the care the player provides, with better care resulting in an adult creature that is smarter, happier, and requires less attention. Gameplay can vary widely between models, and some models, such as TamagoChu, require little to no care from the player. For its current 2 decades, Tamagotchi has gained popularity worldwide.