What is the difference between marketing, advertising, and public relations?

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Marketing
Using strategies and idea development to produce a campaign to offer exposure of a product or brand.

http://en.wikipedia.org/wiki/Marketing


Advertising
Paying to expose the product or brand on a specific venue.

http://en.wikipedia.org/wiki/Advertising


Public Relations
Exposing a company or individual in a new based manner for the purpose of publicity on specific channels.

http://en.wikipedia.org/wiki/Public_Relations


A real effective marketing company may offer all the above as services. As for a career, advertising can be self taught, and an elective may be an idea to diversify your training. Marketing and PR are specialties that both promote but they work in different channels one focuses more on news and media, the other on promotion.