From a marketing perspective, publicity is one component of promotion. The other elements of the promotional mix are advertising, sales promotion, and personal selling. Promotion is one component of marketing.
But the publicist cannot wait around for the news to present opportunities. They must also try to create their own news. Examples of this include: and that people that
The advantages of publicity are low cost, and credibility (particularly if the publicity is aired in between news stories like on evening TV news casts). New technologies such as weblogs, web cameras, web affiliates, and convergence (phone-camera posting of pictures and videos to websites) are changing the cost-structure. The disadvantages are lack of control over how your releases will be used, and frustration over the low percentage of releases that are taken up by the media.
Publicity draws on several key themes including birth, love, and death. These are of particular interest because they are themes in human lives which feature heavily throughout life. In television serials several couples have emerged during crucial ratings and important publicity times, as a way to make constant headlines. Also known as a publicity stunt, the pairings may or may not be truthful.
One example would be the Australian Tourism Board's "So where the Bloody Hell are you?" Advertising Campaign that was initially banned in the UK, but the amount of publicity this generated resulted in the official website for the campaign being swamped with requests to see the banned ad. 
The popular sitcom, Married... with Children, achieved skyrocketing ratings after moralist Terry Rakolta attempted to have it removed from the air.