Modes in C Major
In any key, the 1 to 1 [in this case, C to C] is Ionian. The 2 to 2 [D to D here] is Dorian, and so on.
Here we have the modes in order, with tone names. We can see that all of the tones are the same; each is its own scale.
The Major modes are Ionian, Lydian, & Mixolydian [I, IV, V].
The minor modes are Dorian, Phrygian, Aeolian [ii, iii, vi].
Locrian is a minor mode with a flat 5 [diminished – viio].