An octave is the distance of twelve semitones from two musical notes. It is called an octave because it is the note eight away from the root note in a seven-note scale - it's the same as the root note only higher. Octaves are used loads in bass lines but are also important to know because you can find notes on the fretboard and play patterns all over the neck very easily and quickly. All this just by knowing a few patterns.
This video lesson takes you through five very useful shapes that will unlock the fretboard for you in no time. Check out more fretboard knowledge lessons here.
5 Octave Patterns