An agency means a company, business, entity, or group, which offers any specific service to other businesses/individuals, or on behalf of any other entity, individual, or group. It also equates to any intervention or measures for generating any specific effects.
It means any entity, group, or company that is carrying on business activities in some spheres. In some cases, it means any entity/group doing business on behalf of any other individual/entity/group. It also means the relationship between the agent of an individual/entity and the entity/individual (called the principal here). It also means operation, action, or measures and the capacity of implementing/exerting them. It also means any administrative department/division of a bigger entity.
Real estate agencies are businesses, collectives, entities, companies, or groups, which facilitate the buying, selling, renting, or management of properties, land, homes, and buildings. They function on behalf of the property owners or property buyers. These agencies are comprised of individual real estate agents and other personnel helping to arrange and facilitate real estate/property transactions. They get a percentage of the purchase/sales value of the property as their commission. Agencies are required to be licensed/affiliated to regulatory authorities as per varying regulations in different States, cities, and countries.