Category cable is a wire standard that is used for signal and power distribution. It is often referred to as 'Ethernet' cable, but that is just one of the uses. There are several versions of the standard, so you will see "Cat 5", "Cat 5e", "Cat 6", etc. It is usually terminated with an "8P8C" connector, which is commonly and incorrectly called RJ45.
A pervasive computer networking technology.
Caution: frequently people may use the term "Ethernet" to refer to the cable type in non-ethernet applications. In those cases the cable would more correctly be called "Category Cable".
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Colours can be created mixing different light colours some combinations cannot easily be identified as different even though their recipe is. For example yellow is a colour that exists in the colour spectrum. And if we mix the right amounts of red and green, our eyes and brains cannot distinguish that from pure yellow.
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An electrical connector made by Neutrik that is very common in the lighting industry. See wikipedia.
A group of 512 DMX channels. A large lighting system may have dozen our even thousands of universes.