SpongeBob SquarePants (born July 14, 1986) is the main protagonist of the animated series of the same name. He was designed by show creator and former marine biologist, the late Stephen Hillenburg. Hillenburg based SpongeBob on Bob the Sponge, a character he had created for his educational book The Intertidal Zone in the late 1980s.

SpongeBob is a childish, joyful, and clumsy sea sponge who lives in a pineapple with his pet snail Gary in the underwater city of Bikini Bottom.

He works as a fry cook at the Krusty Krab, a job which he is exceptionally skilled at and enjoys thoroughly. He attends Mrs. Puff's Boating School, and his greatest dream in life is to receive his boating license. Unfortunately, he tenses up whenever he has to drive a boatmobile, and he drives recklessly. SpongeBob is very good-natured and loves to hang out with his best friend, Patrick. His teacher is Mrs. Puff and his boss is Mr. Krabs. In The SpongeBob Musical, SpongeBob's exact species of sea sponge is identified: Aplysina fistularis, a yellow sea sponge that is commonly found in open waters.

SpongeBob appears in some form in every episode of the series, beginning with the series' debut episode, "Help Wanted." He is voiced by Tom Kenny, who is married to Karen Plankton's voice actress, Jill Talley.

More facts here: https://spongebob.fandom.com/wiki/SpongeBob_SquarePants_(character)