A handshake can refer to either a personal physical greeting between two individuals or an exchange of signals between computers or peripherals to establish a communication link.
A packet is a unit of data sent across a network. When a large block of data is to be sent over a network, it is broken up into several packets, which are then sent separately and reassembled at the destination.
A policy is a deliberate system of principles to guide decisions and achieve rational outcomes. It is a statement of intent, and is implemented as a procedure or protocol. Policies are generally adopted by a governance body within an organization.
