Tourism is an industry which includes all kind of economic activities or businesses related to travels, for recreational, leisure or business purposes, made by a person or persons that stays in places, at least two nights, outside their usual environment.

This means that Tourism is not the activity or practice of touring, especially for pleasure, but the business or industry of providing information, accommodations, transportation, and other services to tourists, such as the promotion of destinations and products. Tourism is based on the travel of people that are visiting places other than their homes.

I think what you meant is "What is Tourism?"

Tourism is a study of man away from his usual habitat, of the industry which responds to his needs and of the impacts that both he and the industry have on the host socio-cultural, economic and physical environments.http://wiki.answers.com/#_ftn1

Answers.comJackson, I, (1989), An Introduction to Tourism, Hospitality Press Pty Ltd, Australia

(1) Advertising

Any paid form of non-personal communication of ideas or products in the "prime media": i.e. television, newspapers, magazines, billboard posters, radio, cinema etc. Advertising is intended to persuade and to inform. The two basic aspects of advertising are the message (what you want your communication to say) and the medium (how you get your message across)

(2) Personal Selling

Oral communication with potential buyers of a product with the intention of making a sale. The personal selling may focus initially on developing a relationship with the potential buyer, but will always ultimately end with an attempt to "close the sale".

(3) Sales Promotion

Providing incentives to customers or to the distribution channel to stimulate demand for a product.

(4) Publicity

The communication of a product, brand or business by placing information about it in the media without paying for the time or media space directly. otherwise known as "public relations" or PR.