Pipe connections, also known as pipe fittings, are components used to connect two pipes together. They come in a variety of shapes and sizes and are used in plumbing, irrigation, and other piping systems. The term 'ELLS' is an acronym for Elbows, which are one type of pipe connection that changes the direction of the pipe. Elbows are available in different angles, such as 90 degrees, 45 degrees, and 22.5 degrees.