Ever wondered why some fan connectors have three pins whilst others have four pins, or why your DC (voltage) controlled fan cannot slow down to nearer 50% speed? This video explains all that quite nicely.
Watch at LFC#191 - 3pin DC Fans vs 4pin PWM Fans
I've talked about PWM on the channel a few times, but here's a dedicated video about how it applies to fans, and how it gives us far greater control over fan...
source https://gadgeteer.co.za/good-demonstration-video-difference-between-dc-and-pwm-controlled-case-fans
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