Discrimination is the unfair or prejudicial treatment of people and groups based on characteristics such as race, gender, age, or sexual orientation. The ability to distinguish between stimuli or objects that differ quantitatively or qualitatively from one another.Discrimination is the process of making unfair or prejudicial distinctions between people based on the groups, classes, or other categories to which they belong Measure: In your day-to-day life, how often do any of the following things happen to you? 1. You are treated with less courtesy than other people are. In psychology, discrimination refers to an organism's ability to differentiate between a specific stimulus and similar ones but not identical stimuli. Discrimination could be anything from offensive comments and micro-aggressions to blatant harassment and retaliation. 474-483, San Diego, CA: Academic Press. Characteristics associated with race, such as hair texture or facial features. Such discrimination undermines diversity and equality in the workforce.