Chromatics in Music are when notes are walked up in half steps. Watch this video for more information. To understand half steps in music yo only need to look at a piano. Notice how it has both white and black keys. This is important, because as you walk up the notes, you’ll notice that it all a series of half steps.
One minor challenge is going from E to F – that’s a half step, but now notice that the next half step is to jump from F-F#. So you’ll quickly learn that some half steps jump from letter to letter, while others jump from G to G# or A to A#.