What is the difference between a DMX/XLR cables?

Though DMX cables and XLR cables are often both three-pin cables and look the same, they should not be used interchangeably, especially along longer cable runs. DMX cables and XLR cables are engineered to handle different types of information at different impedance. Though some people attest to the interchangeability of DMX and XLR cables, proper DMX cables should be used especially in more complex lighting systems using DMX controllers.