The series follows SpongeBob SquarePants, an energetic and optimistic sea sponge who lives in a submerged pineapple, and his aquatic friends. SpongeBob has a childlike enthusiasm for life, which carries over to his job as a fry cook at a fast food restaurant, the Krusty Krab. One of his goals is to obtain a boat-driving license from Mrs. Puff's Boating School, but he never succeeds. His favorite pastimes include "jellyfishing", which involves catching jellyfish with a net in a manner similar to butterfly catching, and blowing soap bubbles into elaborate shapes. He has a pet sea snail with a pink shell and a blue body named Gary, who meows like a cat.
The series takes place primarily in the benthic underwater city of Bikini Bottom located in the Pacific Ocean beneath the real-life coral reef known as Bikini Atoll. Its citizens are mostly multicolored fish who live in buildings made from ship funnels and use "boatmobiles", amalgamations of cars and boats, as a mode of transportation. Recurring locations within Bikini Bottom include the neighboring houses of SpongeBob, Patrick, and Squidward; two competing restaurants, the Krusty Krab and the Chum Bucket; Mrs. Puff's Boating School, which includes a driving course and a sunken lighthouse; the Treedome, an oxygenated glass enclosure where Sandy lives; Shady Shoals Rest Home; a seagrass meadow called Jellyfish Fields; and Goo Lagoon, a subaqueous brine pool that is a popular beach hangout. When the SpongeBob crew began production of the series' pilot episode, they were tasked with designing stock locations, to be used repeatedly, where most scenes would take place like the Krusty Krab and SpongeBob's pineapple house. The idea was "to keep everything nautical", so the crew used plenty of rope, wooden planks, ships' wheels, netting, anchors, boilerplates, and rivets to create the show's setting. Transitions between scenes are marked by bubbles filling the screen, accompanied by the sound of rushing water. The series features "sky flowers" as a main setting material. When series background designer Kenny Pittenger was asked what they were, he answered, "They function as clouds in a way, but since the show takes place underwater, they aren't really clouds. Because of the Tiki influence on the show, the background painters use a lot of pattern." Pittenger said the sky flowers were meant to "evoke the look of a flower-print Hawaiian shirt".
Series creator Stephen Hillenburg first became fascinated with the ocean as a child and began developing his artistic abilities at a young age. Although these interests would not overlap for some time—the idea of drawing fish seemed boring to him—Hillenburg pursued both during college, majoring in marine biology and minoring in art. After graduating in 1984, he joined the Ocean Institute, an organization in Dana Point, California, dedicated to educating the public about marine science and maritime history. While Hillenburg was there, his love of the ocean began to influence his artistry. He created a precursor to SpongeBob SquarePants: a comic book titled The Intertidal Zone used by the institute to teach visiting students about the animal life of tide pools. The comic starred various anthropomorphic sea lifeforms, many of which would evolve into SpongeBob SquarePants characters. Hillenburg tried to get the comic professionally published, but none of the companies he sent it to were interested. A large inspiration to Hillenburg was Ween's 1997 album The Mollusk, which had a nautical and underwater theme. Until his death in 2018, Hillenburg had served as the executive producer over the course of the series' entire history and functioned as its showrunner from its debut in 1999 until 2004. The series went on hiatus in 2002, after Hillenburg halted production on the show itself to work on the feature film The SpongeBob SquarePants Movie. Once the film was finalized and the third season finished, Hillenburg resigned as the series' showrunner. Although he no longer had a direct role in the series' production, he maintained an advisory role and reviewed each episode. When the film was completed, Hillenburg intended it to be the series finale, "so [the show] wouldn't jump the shark." However, Nickelodeon wanted more episodes. Hillenburg appointed Paul Tibbitt, who had previously served on the show as a writer, director, and storyboard artist, to take over his role as showrunner to produce additional seasons. Hillenburg considered Tibbitt one of his favorite members of the show's crew, and "totally trusted him". On December 13, 2014, it was announced that Hillenburg would return to the series in an unspecified position. On November 26, 2018, at the age of 57, Hillenburg died from complications from amyotrophic lateral sclerosis (ALS), with which he had been diagnosed in March 2017. Nickelodeon confirmed via Twitter the series would continue after his death. In February 2019, incoming president Brian Robbins vowed Nickelodeon would keep the show in production for as long as the network exists. As of the ninth season, former writers and storyboard directors Vincent Waller and Marc Ceccarelli act as showrunners. Hillenburg is still posthumously credited as executive producer in episodes as of 2024.
All text has been cited directly from the Wikipedia page on Spongebob Squarepants, which the exception of the characters section, which was cited in my own words.