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A "Controller" either allows / stores pattern & color control for LED(s) or translates a control protocol into one that the LED drivers can listen to. SPI for example...

A Driver is what actually PWMs (Pulse Width Modulation - someone write an article on that) the LED chips to make them light up. Some drivers may not PWM (on / off only?)

Here is a really good external website comparing many larger scale controllers:

Network DMX

These can be controlled via the newer Ethernet based Art-Net or sACN protocols.

Serial DMX

These can be controlled via the older RS-485 based DMX protocol.