RSU 21, or Regional School Unit 21, is a school district located in Maine, serving the communities of Kennebunk, Kennebunkport, and Arundel. The district provides education for students from pre-kindergarten through high school, focusing on academic excellence and personal growth. The district operates several schools, including Kennebunk High School and Kennebunk Elementary School. RSU 21 emphasizes a collaborative approach to education, involving teachers, parents, and the community to create a supportive learning environment for all students.