Is there a difference between Marketing & PR ?

When you hear the term, Public relations, you automatically wonder if it is somewhere or the other related to Marketing. A question that popped into my head when I had started reading up on the topic. But as time passed by, I realized, its definitely not the same. 

Key difference : Advertising is paid  while PR is free !Advertising is creating paid announcements to be promoted through different types of media including online, print, TV, out-of-home and radio. PR, on the other hand, is a strategic communication process that builds mutually beneficial relationships between organisations and the public. It is through PR, that one builds connection with audiences. 

"Public relation is more of a “soft sell” compared to “hard sell”. It emphasizes on information as opposed to marketing which constitutes of paid media, packaging etc. In the art of public relations, one has to spin around their way to manipulate the audience."