This term gets thrown around a lot in production and post-production circles, but if you can understand what it is as a colorist, you can grade with more confidence and with more creativity.
-----
Start creating your own studio-quality show LUTs, camera LUTs, and LUT packs with my pro look design plugin Contour (free trial available): https://procolor.ist/contour-official/
Grab my Voyager LUT Pack. 17 LUTs to provide beautiful looks for any type of project so you can grade faster, take every image further, and attract better and better jobs.
http://procolor.ist/voyager-lut-pack
Get my free Kodak 2383 film print LUT for DWG and ACES here:
http://procolor.ist/freelut
Check out my ebook, The Colorist's 10 Commandments:
http://procolor.ist/ebook