In ancient times, yoga was often referred to as a tree, a living entity with roots, a trunk, branches, blossoms, and fruit. Hatha yoga is one of six branches; the others include raja, karma, bhakti, jnana, and tantra yoga. Each branch, with its unique characteristics and function, represents a particular approach to life.
Some people may find one particular branch more inviting than another. However, it is important to note that involvement in one of these paths does not preclude activity in any of the others, and, in fact, you'll find many paths naturally overlapping.