Implicit Bias: one that is relatively inaccessible to conscious awareness and/or control. For example, even if you say that men and women are equally good at math, it is possible that you associate math more strongly with men without being actively aware of it. (Project Implicit)
Stereotypes: the belief that most members of a group have some characteristic. Some examples of stereotypes are the belief that women are nurturing or the belief that police officers like donuts. (Project Implicit)