Key holders are an essential feature in your home if you tend to lose your keys. Many of us have lost our keys a number of times, if only we had a place to put them once we got home, this is where Key Holders come in.
Port - Most input/output devices are outside the computer case. These devices communicate with components inside the computer case through a wireless connection or through pcables attatched to the case at a connection called a port. (Chad G.