There are three broad types of key switch: clicky (makes a loud click), tactile (tries to feel like there's a click but be fairly quiet), linear (no feeling except gradually increasing resistance).

There are also silent versions of tactile and linear switches.

Clicky switches are inappropriate in every office, and silent switches may be preferred in a particularly quiet office. Typical keyboards (Dell, Apple) fall somewhere between the tactile/linear and silent switch mechanical keyboards.