Suppose you were to visit a certain place, and you had no idea as to what that place is like and you were too lazy to do all the research for your visit, you would require a certain 3rd party which could do all that on your behalf, at a certain price, of course. We would call that agency or that 3rd party as a travel agency. Similarly, you can open up your own travel agency, if you think that you have the required resources and the knowledge to fulfill the requirements of the people.

What to look for in Travel agencies

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