What is SPI (Serial Peripheral Interface) Pins?

Question :

What is SPI (Serial Peripheral Interface) Pins?

The SPI pins are 10, 11, 12, 13 namely SS, MOSI, MISO, SCK. These pins support SPI communication using the SPI library. SPI bus is a system for serial communication, which uses up to four conductors. One conductor is used for data receiving, one for data sending, one for synchronization and one alternatively for selecting a device to communicate with. It is a full duplex connection, which means that the data is sent and received simultaneously. SPI uses the following four wires: