Why SpongeBob was made?

Answer 1

Same as any other cartoon character: for entertainment ! SpongeBob was created by Stephen Hillenburg, a cartoon worker/marine biologist who loved both his careers. When Rocko's Modern Life was cancelled in 1996 (for which Hillenburg was a producer), Hillenburg began working on SpongeBob SquarePants (although some sketches trace back to 1986).

Answer 2

Because the world needed a hilarious, yellow laughing sponge that wears square pants. :-)