The NCLEX (National Council Licensure Examination) is a standardized exam that each nurse must pass to obtain a nursing license and practice as an RN. There are two types of NCLEX exams: the NCLEX-RN for registered nurses and the NCLEX-PN for practical/vocational nurses. The exam tests knowledge, skills, and abilities essential for safe and effective practice. It is a computer-adaptive test, meaning the difficulty of questions adjusts based on the test-taker's performance.