UART (universal asynchronous receiver-transmitter) is the UART is a computer component that handles asynchronous serial communication. Every computer contains a UART to manage the serial ports, and some internal modems have their own UART.

UDP (User Datagram Protocol) is a communications protocol that offers a limited amount of service when messages are exchanged between computers in a network that uses the Internet Protocol (IP). UDP is an alternative to the Transmission Control Protocol (TCP) and, together with IP, is sometimes referred to as UDP/IP. For more information, please refer to this page
http://www.networksorcery.com/enp/protocol/udp.htm

UNIX is a popular multi-user, multitasking operating system developed at Bell Labs in the early 1970s. UNIX was designed to be a small, flexible system used exclusively by programmers.