Both effects use a short delay modulated by a low-frequency oscillator (LFO). Chorus adds multiple slightly detuned copies for a thick, ensemble sound.
Flanger uses very short delay times (1-10ms) with feedback, creating a dramatic sweeping effect.
Chorus = longer delay + no feedback. Flanger = very short delay + feedback.
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Low Frequency Oscillator — a slow wave that modulates the delay time.