"Flanker back" is a term typically used in American football to describe a player in the backfield who lines up behind the line of scrimmage but outside the offensive tackle position. Synonyms for this position include "slot back", "wing back", and "wide receiver". A slot back typically lines up in the backfield and is used in passing plays or as a blocker, while a wing back is often used in running plays. A wide receiver is similar to a slot back, but typically lines up outside the tackle. Other terms that may be used interchangeably with "flanker back" include "H-back", "halfback", and "scatback". Regardless of the terminology used, all of these positions require speed, agility, and the ability to make quick decisions on the field.