Protocol Meaning:-

Generally, protocol means a set of rules and regulations that should be obeyed for communication.

For example:- Two people A and B want to communicate with each other. But A is from German and B is from France. For a better conversation, they must have to follow one rule i.e they need to communicate over a common language(e.g:- English) which is a common protocol between them. Similarly, in Software, there are different protocols for different communication. Like for network or internet communication there some protocols called TCP/IP, HTTP, FTP, SMTP, etc.

In Electronics, they have some set of rules and regulations (protocol) to communicate between two electronic devices and exchange data between them.

There are two types:-

1. Inter System protocols

2. Intra system Protocols

Inter System protocols:-

The communication between two different Electonic devices. Like communication between laptops and smartphones is called inter-system communication. And the protocol used for this kind of communication is called inter-board communication protocols. For example:-

UART Protocol

USART Protocol

USB Protocol

Intra System protocols:-

The communication between two electronic devices within a circuit board. Like communication between motherboard and harddisk inside your laptop, microcontroller and LED is called intra-system communication. And the protocol used for this kind of communication is called intra-board communication protocols. For example:-

I2C protocol

SPI protocol

CAN Protocol