Open education resources (OER) are educational materials that can be freely accessed online. OER provide benefits such as being more accessible to internet users globally, covering a wide variety of subjects, and reducing the cost of books. However, OER also face challenges, as students and instructors in areas with limited computer access cannot benefit from OER. Additionally, it can take time to find high-quality OER materials, technology is constantly changing, and OER may not be fully developed in many languages.