Motivation is the action and effect of motivating. A person is motivated when he/she feels desire, longing, need, will or lack. Intrinsic motivation comes from within the person, it is voluntary; for example: a hobby, community help.
Extrinsic motivation comes from outside, and arises when a reward is offered; for example: working for money, studying to get a good grade.
And the locus of causality is a mixture of intrinsic and extrinsic motivation.
But to be motivated we need certain elements such as: effort, needs, desires and goals, because with them we can reach our objectives, whether personal or professional.