What does it mean for a group of people to be marginalized?

This are groups that face discrimination.

Explanation:

Different sets  of people of  a  culture, context or  history facing the risk of being subject  to a series of activities that suggest  discrimination due to the undertakings of different personal characteristics or reasons ,  like  sex, age gender, belief, ethnicity, religion  , health status, disability, sexual orientation, gender identity, education or income, or living in various regions .

An example of Marginalized groups are the inhabitants of the Saharan region in Africa .

imagine me knowing the answer

no questions on whether they are allowed that right