Open Educational Resources (OER) are freely available educational materials that can be used without copyright restrictions. OERs come in many formats including textbooks, videos, and games. They cover a wide range of subjects from K-12 to higher education. Some key benefits of OER include free access and use, cost savings, easy updating of materials, and opportunities for customization. However, OER also present some challenges such as difficulty selecting high-quality materials from the vast options, ensuring acceptable academic rigor, and lack of availability for some specialized topics. Overall, while still new, OER are expected to become increasingly important educational resources.