serial communication, parallel communication, SPI and ADC\'s. Write a paragraph about serial communication and how ADC\'s work. Solution Serial Communication: Serial Communication is process of sending data one by one at a time over a communication channel. Parallel communication: Parallel Communication is method of conveying multiple bits at a time over a communication channel. Serial Peripheral Interface: This is used to send data between microcontrollers and small peripherals. It uses clocks and data lines along with a select line to choose the device we wish to talk to. ADC working: ADC takes input signal as analog signal. It uses a circuit which converts this analog signal to appropriate digital signal. You can refer to wikipedia or any other links for the circuit which converts analog signal to digital signal..