We have 12 notes to make music from, but we find it better not to use all 12 in the same song. So we pick up fewer of them. 7 notes is a common choice, and you can guess there are many options to select 7 notes among 12. Each of these selections can be called a scale (or a mode). Then you can play any of these 7 notes in any order and rythm to make a melody. And you can also play several notes at once (usually 3), this is called a chord. Again, there are many chords made with the same 7 notes you have selected. Once you play your melody and the chords together you have a song.
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