Handshakes are used to convey trust, balance, and equality upon meeting or completing agreements. The type of handshake can provide clues about a person's personality, like a weak "wet fish" handshake indicating a weak character. Maintaining eye contact, a firm grip of 3-4 shakes, and keeping a pleasant expression are signs of an appropriate handshake. Body language like eye contact, head position, hand gestures, and posture can also provide signals about a person's mental state, attitudes, confidence levels, and more.