1. The Greasers: This gang is comprised of lower-class, working-class teenagers from the east side of town. They are often associated with lower socioeconomic backgrounds and are perceived as outsiders by the rest of society. The Greasers are led by Ponyboy Curtis and include members such as Johnny Cade, Dally Winston, Two-Bit Mathews, and Steve Randle.
2. The Socs (Socials): The Socs are a group of wealthy, upper-class teenagers from the west side of town. They are seen as the privileged and popular students who come from affluent backgrounds. The Socs are often involved in bullying and harassing the Greasers. The Socs are led by Randy Adderson, and their prominent members include Bob Sheldon, Cherry Valance, and Marcia.
The conflict between the Greasers and the Socs stems from social class differences, societal prejudices, and personal conflicts that escalate over time. The tensions between the two groups culminate in a tragic incident that changes the lives of the characters and deepens the divisions between the rival gangs.