A Wing-Girl will be your social proof to meet and attract other women in all situations and locations. She is also good company to be around, the Wing-Girl can either help you attracting the women, invite women to join you or be a good company if you just want someone to hang out with.
Social proof is a psychological and social phenomenon where people assume the actions of others in an attempt to reflect correct behavior in a given situation. Basically, if women see you with hot women they assume you are what they are looking for as the Wing-Girls have done the work for them. Checking if the man is good enough and all the other qualities that women are looking for. Example leader of men, protector of loved ones, willingness to emote, etc
Demonstration of Higher Value (DHV) Quick Definition: A story or action used to increase the perceived value of a PUA within a setting, which results in increased attraction and interest from the opposite sex. Also known as Display High Value.