A handshake between 2 persons is a remnant of ages long past - from the very caveman days. When 2 prehistoric people met, they put their hands in the air, revealing their open palms, so that the other person could see that they carried no weapon. This gesture changed over the centuries and in modern times the ancient greeting ritual is expressed in the form of clasping and shaking of the palms. The handshake is done at the beginning and end of the meeting.
One can quickly create a first impression depending on the power of the handshake and the way the other person presents their hand. To make a good first impression, hold that person's hand firmly but not too hard. A handshake using both hands is a sign of attachment, so don't do it when meeting a new person.
There are 5 main types of handshake - subservient, political, very strong, dead fish and dominating. A dead fish type of handshake (a loose hand and slow shake) bespeaks of an unserious person who lacks character. It may even be seen as a sign of contempt.
A dominating handshake is with the palm facing down, covering the other person's hand just slightly. This is how a person of power shakes hands, demonstrating his superiority and steadfastness. A subservient handshake is the exact opposite - with the palm presented facing up. This type of person is indecisive and incapable of defending their position.
A handshake that's too strong can even be painful. This is the type of handshake used by someone who wants to be taken serious, who seeks recognition and attention. A political handshake uses both hands - the left hand covers the right.