Trained people, typically female, who stand on the sidelines of a sporting event and cheer for one of the teams. They usually chant, move in formation, and perform acrobatics.
Cheerleaders are typically groups of trained female supporters who cheer for a team competing in a sporting event. They usually wear shirts and generally revealing outfits both for visual appeal and freedom of movement. They hold a brightly colored pom-pom in each hand and as a group they chant, strike poses in formation, and perform acrobatics.