Universal Design for Learning (UDL) aims to make learning accessible to all students by providing multiple means of representation, expression, and engagement. It is based on three principles that align with the three main areas of the brain involved in learning - recognition, strategic, and affective. UDL uses flexible methods, technologies, and tools to present information, allow students to demonstrate knowledge, and foster engagement. When implemented well through goals, student grouping, and learning profiles, UDL can boost achievement by increasing access to content and student engagement.