Colleges look for students with well-rounded resumes so being a part of clubs, groups or teams can help you stand out. Some of these clubs may also have academic components, while others are based on artistic or athletic pursuits.
Being a member of various student organizations can give you access to certain scholarships, often run by national branches. For example, the national Girl Scouts organization offers several types of scholarships just for its members. Also, being part of a club can show your interest and passion in a field that also lends itself to scholarship opportunities.