Transfer is a specific type of exchange where an entity or entities are exchanged in return for zero value. Transfer is most common in multiplayer team games where players will transfer items to their teammates for the benefit of the team.
Strong Example In Neverwinter Nights, a player-controlled entity may transfer an item to another player-controlled entity without receiving anything in return. This often occurs if the entity giving the item cannot use the item, but the entity receiving it can use it. Additionally, players may use this as a strategy to allow the entity to use an item that would benefit from it the most.
Strong Example In Warcraft III, players can transfer resources (gold or lumber) to an allied player. The giving player receives nothing in return. This is often used if a player has an abundance of resources, and his ally needs more.