Insulation displacement connectors are connectors which can be mounted directly over an insulated wire without stripping the insulation. These connectors come with a sharp blade like arrangement which slices through the insulation and makes contact with the conductor.
The blade and the conductor are cold welded to form a strong connection. Insulation displacement connectors are used in telephone and network circuits. Ribbon cables are generally used with insulation displacement connectors. Ethernet cables are also mounted to insulation displacement connectors.