Open educational resources (OER) are teaching and learning materials that are freely available online for anyone to use, adapt and share. OER include full courses, textbooks, modules, videos and other materials. There are several advantages to using OER, such as reducing costs for students, increasing accessibility of educational resources worldwide, and allowing for customization and incorporation of updated content. However, some disadvantages include the effort required to evaluate and validate large volumes of OER materials, lack of funds to support ongoing updates and maintenance, and potential issues with attribution, copyright and access to technology for disadvantaged students.