The functions of logos depend on the nature of the business they belong to. For instance, a logo would provide the symbol of giving aid to people in Red Cross emblem. A logo could also provide a fashionable look for a fashion industry. Logos are a means of being recognized in the world of business or an easy method of presenting a symbol to the market for remembering you.
Several considerations, which are necessary to make, are given below:

Colors:
Usually, what you will find is that these sorts of companies mostly present the colors of the places they deal with. For e.g., a travel agency dealing in places which are dry and desert like, they will use colors such as sandy brown in their logos. Similarly, a company dealing with places like Malaysia or other islands will use colors like green and aqua.
You will find that nearly all the colors used are according to the nature of the places they deal with.

Fonts:
As said before, you will find the fonts also differing from each other according to the places dealt with. If the company is related to a fancy place such as New York, it might have fonts that are very fancy, and if it is dealing with a formal place, the fonts might be very formal too.