CCT is correlated color temperature. It just is a scale that measures the color the light puts out. The warmer colors, 2200 to 2700 are yellowy orange colors. Like sunrise and sunset. The higher temps 4000, 5000 and up are bluer tones. They are brighter, like midday sunlight, but aren’t that comfortable in your home. I highly recommend 3000k, it’s not yellow, not blue and usually gives the best white light.

Thank for explaining this in a way we can understand. Much appreciated!