Unlawful discrimination can be characterized as direct or subtle.
Direct discrimination involves treating someone less favorably because of their possession of an attribute compared with someone without that attribute in the same circumstances. Examples; sex, age, race, religion, family status, national origin, military status, sexual orientation, disability, body size/shape.
Subtle discrimination involves setting a condition or requirement which a smaller proportion of those with the attribute are able to comply with or without reasonable justification.