What are they:
Polychords are when two guitarists play two different chords simultaneously to produce a new chord.
This forms a collection of notes that can be arranged into at least two triads or a seventh chord. A triad being a chord that usually contains the root, a third and a fifth interval. You can read more about triads here.
For example, combining an Am triad (A C E) with a C triad (C E G) forms an Am7 chord (A C E G).
There are literally thousands of combinations to try out, but here are some more examples to give you an idea what is achievable! (Note that the C chords are based around the 8th fret)
Example 1. C + Am = Am7
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Example 2. C + F = Fmaj9
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Example 3. C + Dm = Dm11
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Example 4. C + Bb = Bb6/9add#11
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