Who won 'American Idol'? Full list of former winners and runners-up

"American Idol" has officially wrapped its 21st season, crowning Iam Tongi, an 18-year-old from Hawaii, as the latest winner on Sunday night.

Each season, contestants from across the U.S. compete to achieve music superstardom. They audition for -- and are later critiqued and guided by -- judges, including country singer Luke Bryan, pop star Katy Perry and music legend Lionel Richie. One person is left standing in the end, making them the next American Idol.

"American Idol" premiered on Fox in 2002 and ran for 15 seasons before ending in 2016. The singing competition show then returned to primetime on ABC in 2018 and has now concluded its 21st season overall, its sixth season since being revived.

Previous winners, such as Kelly Clarkson, Fantasia Barrino and Carrie Underwood, have gone on to snag Grammys and build massive careers, establishing an impressive legacy for the show.

Some contestants who didn't win have also gone on to have equally -- if not more impressive -- careers and achievements. Just look at EGOT winner Jennifer Hudson, for example, who came in seventh place her season.

While we wait for another season of showstopping performances, scroll down for a full list of past winners and runners-up:

Season 1: Kelly Clarkson (with runner-up Justin Guarini)

Season 2: Ruben Studdard (with runner-up Clay Aiken)

Season 3: Fantasia Barrino (with runner-up Diana DeGarmo)

Season 4: Carrie Underwood (with runner-up Bo Bice)

Season 5: Taylor Hicks (with runner-up Katharine McPhee)

Season 6: Jordin Sparks (with runner-up Blake Lewis)

Season 7: David Cook (with runner-up David Archuleta)

Season 8: Kris Allen (with runner-up Adam Lambert)

Season 9: Lee DeWyze (with runner-up Crystal Bowersox)

Season 10: Scotty McCreery (with runner-up Lauren Alaina)

Season 11: Phillip Phillips (with runner-up Jessica Sanchez)

Season 12: Candice Glover (with runner-up Kree Harrison)

Season 13: Caleb Johnson (with runner-up Jena Irene)

Season 14: Nick Fradiani (with runner-up Clark Beckham)

Season 15: Trent Harmon (with runner-up La'Porsha Renae)

Season 16: Maddie Poppe (with runner-up Caleb Lee Hutchinson)

Season 17: Laine Hardy (with runner-up Alejandro Aranda)

Season 18: Just Sam (with runner-up Arthur Gunn)

Season 19: Chayce Beckham (with runner-up Willie Spence)

Season 20: Noah Thompson (with runner-up HunterGirl)

Season 21: Iam Tongi (with runner-up Megan Danielle)

Who won 'American Idol'? Full list of former winners and runners-up originally appeared on goodmorningamerica.com