These are some of my "QSL" cards that confirm contacts that I have made all over the world!
The ARRL requires proof that a amateur radio operator has contacted a country. Hams exchange cards with contact info as proof. Over time the cards developed into a fantastic art form!f
Most contacts are now confimed over the internet using the ARRL's Logbook of the World. It is still great getting these cards!
According to Wikipedia: "The DX Century Club, or DXCC, is an amateur radio operating award earned by making a distant contact, or DX, with 100 or more geographic entities around the world."
There are three basic types of amateur radio operators: Rag Chewers, Contesters, and DXers.
Rag chewing is when an operator gets on the air and talks at length with friends around the country and world about life and stuff. Friendly bantor, no politics or religon.
Contesters like to compete. They enter events and try to make as many contacts as possible in a given time period. The look for any advantage. They tend to have the best equipment and endurance to spend long hours making thousands of contacts.
Dxers, like me, are interested in contacting as many "entities" as possible. There are currently 340 entities. I spend most of my time listening and checking the DX cluster for new countries. When a new one is on the air I will keep trying to "work" it until I have made contact. This involves exchanging call signs and signal reports. It ususally only takes 20 or 30 secounds to exchange information.. but it might take hours or days or years to make the intital contact.