Rounded shoulders and spine ?

Is the condition "Rounded Shoulders" considered as a form of kyphosis?
Is it the muscles that are overstretched or the spine is abnormal as well? (I'm 19 and I spend a lot of time behind the computer).
What's the best way to correct it and will the spine suffer from it ?
Thank you

Here is an exercise you can use to try and correct it.

Stand with the feet shoulder width apart, feet parallel and pointing straight forward. Make sure you're standing erect and vertical. Straighten the arms, then raise them to shoulder height and parallel with the floor. Palms can be down or up. Begin making small circles with the arms and hands. Concentrate on putting more emphasis on the circle toward the rear. Start with ten circles in one direction and then change directions and repeat the same amount of repetitions in the other direction. Next, if the palms were down, turn them up and repeat the above sets. If you bend the knees while doing the exercise you can work the quadriceps. Standing on the toes with bent knees will help improve balance and strengthen the calf and other leg muscles. Start slow and work up.