We usually use a camera to take snapshots: quick, on-the-spot pictures that preserve personal memories. It has deep personal meaning, but it's not as meaningful to people not directly connected to the event.
A photograph is something done with a lot of thinking, trying to create an artistic image that will appeal to many people, even if they weren't directly linked to the event portrayed.
Use the links below to help you understand how to be a better photographer. Most of the sites have lots more information than what's linked, so look around to find more.
Many of the links below came from a very helpful site that deserves further exploring: Digital Photography School