All the colours you can "touch" (i.e. all the colours of objects) are called subtractive colours.

We perceive these colours, because the respective object absorbs parts of the light spectrum, and reflects other parts. The reflected light makes up the object's colour.

A black object, for example, doesn't reflect any light, and as a result is perceived as black.

Subtractive colours were named this way, because they absorb (subtract) parts of the spectrum. A full spectrum is seen as white.

A combination of all three primary colours - in the subtractive colour systems they are cyan, magenta and yellow - yields (a kind of) black.