Often the term meditation is ascribed with two meanings. One definition sees meditation as a sustained mental focus which can include action (yoga, making music, etc.) and which also may be characterized by a continued contemplation of a single idea.
The more strict definition of meditation sees the act as one of intentional inward focus wherein the mind contemplates itself. The idea is to attain a single-mindedness and a special kind of internal quiet.
Either way you look at meditation, the practice can be very beneficial to people who have trouble focusing. Meditation strengthens mental discipline and that can't hurt.