Released in 1987, Hysteria is the fourth studio album by Def Leppard. Produced by Mutt Lange and released by Mercury Records, this album features mega-hits like "Pour Some Sugar on Me" and "Love Bites," showcasing the band's polished sound and masterful songwriting. The vibrant cover art, featuring a striking image of a cat and bold colors, reflects the album's high-energy themes and commercial success, helping it become one of the best-selling albums of all time.