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Open Educational Resources (OER) encompass a wide range of freely accessible and openly licensed educational materials. These materials can be used for teaching and learning, and they include various formats like textbooks, courses, modules, videos, and more. Essentially, anything that can be used for teaching and learning can be OER if it's free to use and share, often with permissions for adaptation and redistribution. These are some of the types OER:

• Text-based, like textbooks or articles.
• Video-based, like lectures or demonstrations. 
• Animation-based, like simulations or interactive tutorials.
• Multiple Media: Materials that combine different types of media, like text, video, and interactive elements. 
• Self-Published: Resources created and shared by individuals without formal review.
• Peer-Reviewed: Resources that have been evaluated by experts in the field to ensure quality.
• Refereed: Resources that have been reviewed and approved by a formal review board.