Postcard collecting is known as deltiology and is considered one of the three biggest collectible hobbies around the world. Lester Wunderman was known for being the creator of contemporary direct marketing and established the 1800 toll free number along with the magazine description card. Because of this man, the creation of direct mail postcards was plausible and still exists today. These direct mail postcards are great for sending well wishes to someone that you are thinking about, to let family and friends know you are enjoying your vacation, or simply to serve as collectibles for your hobby. There are also business postcards that you are practical for companies needing to send reminders or advertisements to people all over the world.