Comformity - An individual is influenced to adjust or change his/her behaviors, attitudes, feelings, and or beliefs in order to "fit in" or "belong" to a group.
Compliance - This is often referred to as an active form of social influence. The person does what the other explicity or implicity ask him/her to do, though he/she remains to have an option whether or not to.
Obedience - This involves abiding by the direct orders of someone who is regarded as an authority figure.