The document discusses Open Educational Resources (OERs), which are educational materials like course modules, videos, and textbooks that are freely available online for anyone to use under an open license. It provides reasons to use OERs such as offering free resources to students, supplementing existing course material, and saving time by reusing quality materials created by others. It also notes some words of caution about OERs, such as ensuring the quality of materials used and educating others on the benefits of OERs. The document encourages opening the door to lifelong learning by sharing OERs with students.