There are many hobbies in this world. Generally, a hobby is undertaken by a person for purposes of relaxation or pleasure, as something to do in their spare time. Personal tastes play a large role in what hobbies a person might adopt; what is interesting for one individual may be boring for another.
One of the questions that I get asked the most as a stamp dealer is «What is my stamp collection worth? ». Obviously, many collectors adopt this hobby simply because it is a passion, but others also hope that their collection may eventually have some re-sale value. How can you tell what your collection is worth?