Public relations or PR is a strategic communication process that builds mutually beneficial relationships between organizations and their publics. An advertising agency is a service that creates advertising material, contracts for publication space and sometimes undertakes market research on behalf of its clients. Advertising agencies
and public relations are commonly confused as being one and the same, however, they're not. Although they share similar goals in concept, they have extremely different strategies.
PR specialists use a variety of tools and techniques to build a relationship with a targeted audience. The press release is one of the most effective PR tools. Information that is communicated as part of a regular radio or television program, newspaper, and other mainstream media, achieves a much bigger impact than advertisements.
Read more: The Differences Between Public Relations and Advertising Agencies