What is a FIFO?
FIFO is otherwise known as 'named pipes'. FIFO (first-in-first-out) is a particular file which is said to be data transient. Once data is read from named pipe, it can't be read again. Also, data can be read only in the order written. It is used in inter-process communication where a process writes to one end of the pipe and the other reads from the other end.