Final answer:
The practice of excluding low-income people from certain neighborhoods is known as redlining, which often coincides with white flight and NIMBYism.
Step-by-step explanation:
The term that applies to the practice of keeping low-income people out of a particular neighborhood is redlining. This discriminatory practice involves the withholding of services or products, like mortgages or other loans, based on race or income, effectively preventing certain groups of people from living in specific neighborhoods. The term white flight also relates to this issue, describing the tendency of white residents to leave neighborhoods when minority families begin to move in. Additionally, the practice of NIMBYism (Not In My Backyard) refers to residents, often wealthier and politically active, opposing undesirable developments, such as certain businesses or types of people, in their neighborhoods while being indifferent to these same elements being introduced into neighborhoods with lower-income or minority residents.