Vibrance
Vibrance boosts the less saturated colors in your photo while leaving the already strong ones alone. That makes your image more colorful without going loud. Skin tones stay natural, because vibrance deliberately protects them.
Think of vibrance as the safer sibling of saturation: it lifts dull colors without overdoing red skin or a bright sky. For portraits, vibrance is almost always the better choice over saturation. Combine a little vibrance with a targeted tweak in the HSL panel when you want one color to stand out. Too much vibrance quickly makes blues and greens look unnatural, so keep checking.
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The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.