TCP\IP or Transmission Control Protocol \ Internet Protocol is a stack or collection of various protocols. A protocol is basically the commands or instructions using which two computers within a local network or the Internet can exchange data or information and resources.
Transmission Control Protocol \ Internet Protocol or the TCP\IP was developed around the time of the ARPAnet. It is also known as the Protocol Suite. It consists of various protocols but as the TCP (Transmission Control Protocol) and the IP (Internet Protocol) are the most, well known of the suite of protocols, the entire family or suite is called the TCP\IP suite.
The TCP\ IP Suite is a stacked suite with various layers stacked on each other, each layer looking after one aspect of the data transfer. Data is transferred from one layer to the other. The Entire TCP\ IP suite can be broken down into the below layers-:
Layer Name Protocol
Link Layer (Hardware, Ethernet) ARP, RARP, PPP, Ether Network Layer(The Invisible Layer) IP, ICMP Transport Layer UDP, TCP Application Layer(The Visible Layer) The Actual running Applications like-: FTP client, Browser Physical Layer (Not part of TCP \IP) Physical Data Cables, Telephone wires
Data travels from the Link Layer down to the Physical Layer at the source and at the destination it travels
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