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 .

what are the options?

swahili is an extremely rich and complex civilization, a set of ethnic groups articulated by a language and a series of cultural elements that fuse the african traditions, islam and indian culture. this growth was largely a result of the indian ocean trading network that brought in not just man-made riches, but also religious ideas, specifically islam, which had a significant impact on the local culture. furthermore, the development of the swahili language gave a common cultural unity to the people.