I'm new... Can someone explain receivers for me?

[kareface]

It's an offensive position in American and Canadian football, and is the key player in most of the passing plays. Only players in the backfield or the ends on the line are eligible to catch a forward pass. The two players who begin play at the ends of the offensive line are eligible receivers, as are all players in the backfield. Since these two receivers begin play as the offensive players nearest the sidelines, they are referred to as "wide" receivers. At the start of play, one wide receiver may begin play in the backfield, at least a yard behind the line of scrimmage, as is shown in the diagram at the right. The wide receiver on the right begins play in the backfield. Such positioning allows another player, usually the tight end, to also become the eligible receiver on that side of the line. Such positioning defines the strong side of the field.