Gender bias is a societal concept in which one gender is preferred over another. It can be split into two main categories: implicit and explicit. Implicit gender bias is a form of unconscious bias, which occurs when an individual unconsciously attributes certain attitudes, stereotypes, or gender norms to another person or group of people. Explicit gender bias is a form of conscious bias, in which one intentionally places standards and expectations on another person or group of people based on their own personal beliefs.