Regardless of head count, revenue, market share or strategic communications strategy, the answer to the question, "What is a PR agency?" requires a basic understanding of what is PR.

In this do it yourself guide to launching public relations campaigns, you'll learn about the owned, shared and earned media channels clients pursue to get press coverage.

Once you know what PR firms do, you can make an educated decision of whether you can do your own public relations or if you're better off learning to manage a PR agency.