An agency is a business to serve on behalf of another. A recruitment agency is a place that provides its clients with appropriate jobs. These agencies on return are paid by their clients for rendering this kind of service. Agencies can be either government agency or private agency.
There are several kinds of agencies like an advertising agency, news agency, film agency, moral agency and recruitment agency, there are also agencies that connect adult learners with employees who need experienced staff.
A recruitment agency is generally a consultancy firm which provides its clients with various kinds of jobs in respective fields. It acts as the savior of job-seekers. It is basically a placement center.