Circle of fifths
Playing each note in turn, whether a white or a black note, will give a chromatic scale (e.g. C, C sharp, D, E flat, E, F, F sharp, G, A flat, A, B flat, B, C).  Each step is called a “semitone” or “half tone”.  A “tone” or “whole tone” therefore is a jump of two semitones (C to D, or C sharp to E flat, or E to F sharp).