The Sun Salutation routine is really a warm up for yoga which consists of a sequence of classic yoga postures. It is designed to warm up the muscles and joints in readiness for a yoga session.
Many people use this sequence as a way to training their yoga, or as a form of exercise, by repeating the sequence several times. It includes the classic yoga postures such as mountain pose, plank, cobra, downward dog, forward bends.
The sequence is done with both side of the body leading, to ensure balance.
It includes good instruction on both the breathing, i.e. when to inhale, exhale, and hold your breathe, and also on the movements themselves.