I love blue ,like the blue skie
I like blue as well. It is one of the three primary colors, along with green and red.
Blue signifies a lot of this,its an adjective that qualifies a noun
Blue lies between green and violet on the spectrum of visible light. It is also the color the sky appears.
The rainbow has many colors ,do you know how many?
Well rainbows have a gradient of colors. I don't know how many but there are quite a few.
Have you heard of blue ray ?
Sure, Blu-ray is a digital optical disc storage format. They replaced DVD's in the 2010's.
That then confirms that blue is universal then
HD DVD
HD DVD (short for High Definition Digital Versatile Disc) is a discontinued high-density optical disc format for storing data and playback of high-definition video. Supported principally by Toshiba, HD DVD was envisioned to be the successor to the standard DVD format.
On February 19, 2008, after a protracted format war with rival Blu-ray, Toshiba abandoned the format, announcing it would no longer manufacture HD DVD players and drives. The HD DVD Promotion Group was dissolved on March 28, 2008
Blue
Blue is one of the three primary colours of pigments in painting and traditional colour theory, as well as in the RGB colour model. It lies between violet and green on the spectrum of visible light. The eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colours; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering.