Colour

Colour refers to every variation of hue or neutral that we see.

"There are no bad colours, just some unfortunate colour combinations."Kate Smith
Color Scheme Generator

Hue

Hue refers to the colours of the visual spectrum - red, orange, yellow, blue, indigo and violet.

Black, white, and grey are not hues.

Value

Value refers to the lightness/darkness of a colour.

No colour has a lower value than black or a higher value than white.

You can change just the Value of a Colour by adding black, white or grey.

Tint

When a hue is blended with white (i.e. value is lowered) it is referred to as a tint.

Tone

When a hue is blended with grey it is referred to as a tone.

Shade

When a hue is blended with black (i.e. value is increased) it is referred to as a shade.

Chroma

Chroma refers to the purity of a colour.

Mixing a pure hue with black, white, grey or any other colour reduces its purity and lowers its chroma.

Intensity and saturation are more common terms that mean a similar thing.

RGB

RGB refers to the primary colours of light, Red, Green and Blue. 

Note how these are different to the reflected primary colours, Red, Yellow and Blue. Adding full intensity Red, Green and Blue light together makes white light. Conversely, adding pure Red, Yellow and Blue paint together makes black paint.
Source: Wikipedia - By Monaneko - [Scalable Vector Graphics (SVG) 1.1 Specification http://www.w3.org/TR/2003/REC-SVG11-20030114/types.html#ColorKeywords], Public Domain, https://commons.wikimedia.org/w/index.php?curid=1398092