Just as there are several different mountain paths that you can take to get to the top, there are several different paths to yoga. Different people have different aptitudes, and therefore the same route cannot be applied to all.
A highly emotional person will be drawn towards Bhakti Yoga, an intellectual person may be drawn to Jnana Yoga. Different personality types will be predisposed to one type of yoga, but man is a synthesis of different attributes. Therefore, he can weave the other strands of yoga into his life for a more complete experience.
The different paths are: