Handshakes are a common mode of person to person interaction performed when two people grip and shake the hand of the other. Used for greeting, parting, congratulations, or to make an agreement or promise, the handshake is a universal human exchange in many environments—especially in offices and business transactions. Handshakes are often perceived to be indicators of a persons demeanor and abilities. Strong handshakes are considered confident, while weak handshakes are often seen as shy or timid.