Motivation can be simply defined as the things that induce us to take certain actions or behave in a certain way. It is the why or the reason that drives a person towards a desired goal.
The reasons can be categorized into something that is within us i.e. intrinsic / internal motivation, or something that is external to us i.e. extrinsic / external motivation.
Internal motivation in performing a task occurs when the task in itself is experienced as rewarding and there is no need for any external reward before it is performed. Examples are love of the task, self-satisfaction, sense of achievement, relaxation purpose, etc.
External motivation in performing a task occurs when the task is performed because of an external reward. Examples are praise, recognition, money, stickers, grades, material rewards, etc.
Motivation can be seen as a continuum from being externally driven to becoming more internally driven. All of us start off in life being externally driven. Remember how many children are bribed with sweets or stickers, and do things to get praise from adults. But as we mature and our material needs become more satisfied, we become more internally...