Open Educational Resources (OER) are teaching, learning, and research materials that are freely available for anyone to use, modify, and share. These resources can include textbooks, videos, lesson plans, and even entire courses. OER aim to make education more accessible and affordable, allowing educators and students to benefit from high-quality materials without the cost barriers associated with traditional resources. OER are often licensed under Creative Commons, which allows users to adapt and redistribute the content while giving credit to the original creators. This collaborative approach encourages innovation and sharing in education, fostering a global community of learners and educators who can improve and expand upon existing resources.