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In information technology
Information technology

Information technology , as defined by the Information Technology Association of America , is "the study, design, development, implementation, support or management of computer-based information systems, particularly software applications and computer hardware." IT deals with the use of electronic computers and computer software to data conv...
, telecommunications, and related fields, handshaking is an automated process of negotiation that dynamically sets parameters of a communications channel established between two entities before normal communication over the channel begins. It follows the physical establishment of the channel and precedes normal information transfer.

It is usually a process that takes place when a computer is about to communicate with a foreign device to establish rules for communication.

When a computer communicates with another device like a modem or a printer it needs to handshake with it to establish a connection.

Handshaking may be used to negotiate parameters that are acceptable to equipment and systems at both ends of the communication channel, including, but not limited to, information transfer rate, coding alphabet
Alphabet

An alphabet is a standardized set of letter basic written symbols each of which roughly represents a phoneme, a spoken language, either as it exists now or as it was in the past....
, parity
Parity

Parity is a concept of equality of status or functional equivalence. It has several different specific definitions.* Parity , the name of the symmetry of interactions under spatial inversion...
, interrupt
Interrupt

In computing, an interrupt is an asynchronous communication signal from hardware indicating the need for attention or a synchronous event in software indicating the need for a change in execution....
 procedure, and other protocol
Protocol (computing)

In computer science, a protocol is a convention or standard that controls or enables the connection, communication, and data transfer between computing endpoints....
 or hardware features.

Handshaking makes it possible to connect relatively heterogeneous systems or equipment over a communication channel without the need for human intervention to set parameters.One classic example of handshaking is that of modem
Modem

Modem is a peripheral device that modulation an analog carrier wave Signal to encode digital information, and also demodulation such a carrier signal to decode the transmitted information....
s, which typically negotiate communication parameters for a brief period when a connection is first established, and thereafter use those parameters to provide optimal information transfer over the channel as a function of its quality and capacity.






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In information technology
Information technology

Information technology , as defined by the Information Technology Association of America , is "the study, design, development, implementation, support or management of computer-based information systems, particularly software applications and computer hardware." IT deals with the use of electronic computers and computer software to data conv...
, telecommunications, and related fields, handshaking is an automated process of negotiation that dynamically sets parameters of a communications channel established between two entities before normal communication over the channel begins. It follows the physical establishment of the channel and precedes normal information transfer.

It is usually a process that takes place when a computer is about to communicate with a foreign device to establish rules for communication.

When a computer communicates with another device like a modem or a printer it needs to handshake with it to establish a connection.

Handshaking may be used to negotiate parameters that are acceptable to equipment and systems at both ends of the communication channel, including, but not limited to, information transfer rate, coding alphabet
Alphabet

An alphabet is a standardized set of letter basic written symbols each of which roughly represents a phoneme, a spoken language, either as it exists now or as it was in the past....
, parity
Parity

Parity is a concept of equality of status or functional equivalence. It has several different specific definitions.* Parity , the name of the symmetry of interactions under spatial inversion...
, interrupt
Interrupt

In computing, an interrupt is an asynchronous communication signal from hardware indicating the need for attention or a synchronous event in software indicating the need for a change in execution....
 procedure, and other protocol
Protocol (computing)

In computer science, a protocol is a convention or standard that controls or enables the connection, communication, and data transfer between computing endpoints....
 or hardware features.

Handshaking makes it possible to connect relatively heterogeneous systems or equipment over a communication channel without the need for human intervention to set parameters.One classic example of handshaking is that of modem
Modem

Modem is a peripheral device that modulation an analog carrier wave Signal to encode digital information, and also demodulation such a carrier signal to decode the transmitted information....
s, which typically negotiate communication parameters for a brief period when a connection is first established, and thereafter use those parameters to provide optimal information transfer over the channel as a function of its quality and capacity. The "squealing" (which is actually a sound that changes in pitch 100 times every second) noises made by some modems with speaker output immediately after a connection is established are in fact the sounds of modems at both ends engaging in a handshaking procedure; once the procedure is completed, the speaker might be silenced, depending on the settings of operating system or the application controlling the modem.