What is Oasis' biggest hit?

Excuse me, could you possibly enlighten me on a matter pertaining to Oasis' discography? I'm particularly intrigued to know, what is considered to be their most significant hit? It's a question that's been bugging me for quite some time, and I'd greatly appreciate it if you could shed some light on this matter. Their music has always fascinated me, and I'm eager to delve deeper into their most popular tracks. Thank you in advance for your assistance.