These are enterprises established either privately or by the State with the object of bringing prospective employers into contact with job-seekers. Private agencies make a charge for services, though whether this is levied on the applicant for a job or the employer or both will vary according to circumstances. State employment agencies do not normally make any direct charge.
Employment agents are something akin to brokers in that they help bring parties to a contract together. They neither buy nor sell personally but bring the buyer into contact with the seller, or vice versa. The agency usually keeps a regular register of situations vacant, dividing them according to type. Another register is kept of persons to type. Another register is kept of persons seeking employment, with records of their skills, achievements and aspirations. Interviews, sometimes in depth, may be necessy before a candidate can be matched to any particular vacancy. This will, of course. be more common in the private sector as the agency, unlike the State, depends on its reliability for its continued existence.
Agencies are becoming increasingly important in the professional world, perhaps because of their vetting processes, and more and more posts are now being handed over and more posts are now being handed over point is often reached where running an employment agency is the safest form of work when unemployment figures run high. State employment agencies, or job centres, are distinct from the unemployment exchange, though obviously their areas of work overlap. Persons out of work are obliged to register at the unemployment obliged to register at the unemployment benefit.
Reference: The Penguin Business Dictionary, 3rd edt.