If you are currently looking for work then you may of registered or considering registering with a recruitment agency. An agency can take a lot of the hassle out of finding a job as they often have hundreds on their books that they looking for the right candidates to put forward.
If you are looking for a permanent position then you may not need to pay anything to register with an agency or to find a job through them. They often take their fees from the employer. If you are looking for temporary work then you may have to give some of your salary to the agency (usually a percentage) for every job you do through them.
It is important that you keep in regular contact with your agency once you have registered in order to ensure that you get put forward for jobs. Your agent may have a number of people who are looking for work and often it is the ones who shout the loudest and are in touch the most that get put forward for the most jobs.
Even if you are registered with an agency, do not stop looking for work by yourself. You may use social media or local papers, but often the more jobs you apply for the better chance you stand of landing one.