The major scale and the Ionian mode are the same scale. I included it in the modes just to make them complete or in case you entered the site from a modal keyword.
This mode because it is the major scale can be used for improvising over every chord in the major scale.
Ionian Scale Formula
The formula for the this mode is 1-2-3-4-5-6-7
Here’s what it sounds like.
I hope you found this page useful.