Public relations is the process of communication between a company, organization or individual and the public. It is generally concerned with creating a favorable public image. It deals with factors such as crisis management, customer and employee relations, communication and the relationship with the community.

Positive affiliations with the public, customers, employees, etc. is very important. In addition, public relations is greatly concerned with how the public portrays these companies, organizations, or individuals.

There are many different areas of public relations including financial public relations and product public relations.

Public relations refers to the process by which a business or a celebrity or even a politician tries to manage their image with the public.  The public is important to the success of these types of people or entities and so they try to keep a positive image.

An example of public relations in the United States right now is that being carried out by the Toyota company.  Many of their cars have been recalled and they are trying to carry out a public relations campaign to restore their image and convince the public to trust them again.

I am assuming you mean Public Relations.  This area of expertise and consulting deals with how businesses and individuals are perceived by the public.  They specialize in improving a public image of a person, product or company.

They are also often employed when there is a problem or scandal that calls into question the morals or wisdom of a politician or an athlete or a celebrity. Tiger Woods has hired a public relations agency to improve his battered image.  Not to be confused with a publicist who specializes in getting someone publicity, just some time in front of the cameras, on the radio or in magazines and newspapers.  That is a different field entirely.