The three categories of wired transmission media are Twisted Pair Cable, Coaxial Cable, and Fiber Optic Cable.

Wired transmission media refers to any physical link that can carry data in the form of signals between the source and destination. These are also known as guided media because data in terms of signals are propagated between the nodes through a physical link made of wire/cable.

Twisted Pair Cable is one of the commonly used wired media. It carries data in the form of electric signals. It consists of twisted wires that help in reducing interference during data transmission.

Coaxial Cable is another type of wired transmission media that also carries electric signals. Like twisted pair, it is a metallic cable used for propagating signals between communicating devices.

Fiber Optic Cable is the third category of wired media. Unlike the other two, it carries signals in the form of light signals instead of electric signals. It is a type of physical link that carries data between nodes efficiently.

Thus, twisted pair and coaxial cable carry electric signals, whereas optical fiber cable carries light signals, making them the three main categories of wired transmission media.