The seventh mode of the melodic minor scale is know as the Altered scale. It is one of the most popular Jazz modes.
It works to create Tension over 7th chords, this mode can be used over both major and minor key ii-V-I’s.
Works well when you apply it to Dominant 7th chords, where you want to bring in the b9,#9,b5, and #5 intervals.
1 - b2 - #2 - 3 - b5 - #5 - b7