A chorus is an effect used to create a richer, thicker sound and add subtle movement. When used with a guitar, a chorus pedal gives a clean electric guitar a "dreamy" quality to its tone.
The chorus effect is based upon a short delay. Incoming audio is split and run through the delay, then mixed with the original audio and sent to the effect's output. With short delay times, the delayed audio blends with the original audio resulting in a wide swelling sound.
A great example of a Chorus that provides a densely lush sound is the Old Blood Noise Endeavors Reflector, and its available at Guitar FX Direct, the UK's leading boutique FX pedal specialist. Order today and enjoy free UK delivery.