Shoulders are one of the most noticeable body parts as they actually add width to your upper body.  With broad shoulders, you will have an impressive physique, especially guys who train for V shape.
Shoulder press works on the front of your shoulders (anterior).  It also works your triceps.

Governor Arnold Schwarzenegger has invented the Arnold Dumbbell press (also known as Rotational Shoulder Press). Otherwise, it would have been known as Bush Press or Clinton Press. It is a compound exercise with wide range of motion. Main muscle worked are shoulders (front and side deltoid muscles). Triceps are involved too.

Side Lateral Raise or Side Arm Raise is an isolation workout for shoulders. It targets the outer head of deltoid.
Steps:

Stand upright, with your feet about shoulder width apart and arms to your sides. Hold a dumbbell in each hand beside your thighs, with your palms turned toward your body. For beginner, start with [...]

A full balanced set of shoulders can help a guy to appear with broader and thicker chest. As for ladies, a well rounded shoulders will create the illusion of a narrower waist. However, big shoulders do not just appear overnight. One of the recommended workouts for shoulders is Front Dumbbell Raise. [...]