Wines are alcoholic drinks which are made by fermenting grape juice. The natural process of fermenting grapes allows it to taste good without adding some extra nutrients like sugars, acids, etc. Basically it is fermented by using different type of yeast, of course wine varies their taste as different types of yeast are incorporated. You can also make wines out of other fruits like apples and berries, and so as producing different varieties of wines with unique tastes.
Anyway, wines made its way through the years and known for its unique taste and ambient that it provides to wine lovers. Some even considers it as a royalty thing, like for example if someone drinks wine we often think like they look elegant. Others think that it is a formal thing to drink wine while having conversations.
Different types of wine have its own taste, so as there are wine experts that know exactly how to differentiate each one. It is a good talent for some one who knows how to do it. There are also wine clubs that you can join and ask some information about your favorite wine. Basically they know what are the good wines and so as recommending what type of wines to be drink for all occasions. For example wine experts know what wine to be drink on a type of meal you are eating, or maybe what type of wine to be given on certain type of persons. There are some of my friends that are in to these wine clubs. They told me that not only they are learning, but also getting good wines for a lower cost. Personally I believe that it is also good to know something about things like wines, reading through articles and stories is also one way. Another way is by asking the experts to know more of what you are looking for.