Also, look at:	Travel agency is a business that sells travel related products and services to end-user customers on behalf of third party travel suppliers, such as airlines, hotels, yacht charter operators and cruise lines.			related sites
Sidenote For the purposes of this site only, the term "travel agency" will define the company who can book your holidays under commission in your country.  As opposed to a tour operator, who will sell you a "package holiday" and will charge you per head -including the yacht or hotel, the flights and all other sort of expenses-, a travel agency will charge you per yacht/week and the flights separately.