Some of the notes have two different names. The 2nd note (the first black piano key after the C note) may be called C# (pronounced C sharp) or it may be called Db (pronounced D
flat). If you are ascending the scale you would probably refer to the notes as sharps (C, C#, D, D#, etc.). If you are descending on the scale it is usually easier to refer to
the notes as flats (E, Eb, D, Db, C, B, Bb, and so on).
As you can see by looking at the piano keyboard above, there is a sharp (or flat) between all of the notes except B and C and between E and F. This is more fully explained in
the tutorial on the Major Scale.
All of the other scales such as major, minor, pentatonic, or whatever, are subsets of the chromatic scale. This is logical since the chromatic scale uses every possible note.