The C Major Scale also called the Natural Scale since it is the only major scale where all the notes are natural, meaning no sharps or flats. The notes of the C Major Scale are listed be low:

C D E F G A B C

To create the C major Scale the steps between the notes are listed :

Whole Step - Whole Step - Half Step - Whole Step - Whole Step - Whole Step - Half Step

or

WWHWWWH for shorthand.

The C Scale can be sung with:
C     D     E     F     G     A     B   C
Do   Re   Mi    Fa   Sol  La   Ti   Do

Pronounced like:
Doe Ray Me Fa Sol La Tee Do

Scale Degrees

C is the root or one note and other notes are referred to by scale degrees from the root note.
D would be the second scale degree of the C Major scale.