In layman\'s terms, what\'s a RDF triple?
Regarding the answer by Adam N. I believe the O.P. asked a previous question regarding data for a social network, so although the answer is excellent, I will just clarify in relation to the "original original" question. (As I feel responsible).
John | Is a Friend of | James
James | Is a friend of | Jill
Jill | Likes | Snowboarding
Snowboarding | Is a | Sport
Using triples like this you can have a really flexible data structure.
Look at the Friend of a friend (FOAF) perhaps for a better example.