The United States Medical Licensing Exam (USMLE) is a three-step examination required in order to obtain a license to practice medicine in the US. Physicians having an M.D (Doctor of Medicine) degree are required to pass this exam in order to practice medicine in the US. Each step of the exam is equally important and will be scrutinized by the examiners in an unbiased manner. Step 2 has two stages called step 2 CK (Clinical Knowledge) and step 2 CS (Clinical skills). The step 1 and step 2 CK exams can be taken worldwide in Prometric test centers, but the step 2 CS and step 3 exams can be taken only in the US.