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Open Educational Resources (OER) refer to teaching, learning, and research materials in any medium – digital or otherwise – that reside in the public domain or have been released under an open license that permits their free use and repurposing by others. OER include full courses, course materials, modules, textbooks, streaming videos, tests, software, and any other tools, materials, or techniques used to support access to knowledge. These resources are characterized by their ability to be shared, modified, and distributed at no cost, allowing for maximum access and customization based on individual teaching and learning needs. OER can be found in various formats, such as open textbooks, open courses, open journals, open data, and open software. They are created and shared by a community of educators, students, and institutions dedicated to increasing the availability and affordability of high-quality education for all. The use of OER has several advantages, including reduced costs for students, increased accessibility and flexibility in learning materials, and opportunities for continuous improvement through collaboration and feedback. Embracing OER can lead to more equitable educational experiences, fostering a culture of openness, innovation, and inclusivity in teaching and learning environments.