The deadlift is a weight training exercise in which a loaded barbell is lifted off the ground to the hips (or 2 barbells), then lowered back to the ground. It is one of the three powerlifting exercises, along with the squat and bench press.
The Romanian Deadlift exercise works your hamstrings and lower back much more than the conventional deadlift. This is because Romanian Deadlift is performed with rather straight legs compared to the traditional deadlift and relies heavily on the hamstrings and lower back as sources of strength.
Main Muscle Worked Hamstrings Other Muscles: Calves, Glutes, Lower Back
Caution: This is not an exercise that is recommended for people with lower back problems. Also, it needs to be treated with the utmost respect paying special attention not to round the back forward too much as you move the torso. Finally, jerking motions or doing too much weight can injure your back.