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The triad is the smallest chord. All chords are based on the triad.
The triad (from tir, meaning three) is built of two thirds placed over each
other. The tones of a triad are the ROOT, (the tone from which the
triad is
built), the third above, and the fifth above.
In the case of the C in the key of C:
ROOT is “C”
Counting on the scale; C, D, E, F, G, A, B, C the third note is “E” and the
fifth is “G”. The triad for C Maj is comprised of the notes C, E,G in any
order.
The triad may be built on each
degree of the major and minor scale.