A major scale is a seven note diatonic scale. Whenever you see a scale or chord formula it is always written relative to the major scale. The major scale has seven modes starting with Ionian which is a major scales modal name, followed by Dorian, Phrygian, Lydian, Mixolydian, Aeolian and Locrian.
Major Degrees: 1-2-3-4-5-6-7 or I-II-III-IV-V-VI-VII
Stepping: whole - whole - half - whole - whole - whole - half or W-W-H-W-W-W-H
Tonal: tone / tone / semi-tone / tone / tone / tone / semi-tone or 2-2-1-2-2-2-1
Commonly used in: Western music
Also known As: Ionian mode