when protecting a strong hand for example Ah Ks on a Ad 8c 3c post flop I've seen players bet the flop hard in position against 1 caller. then checking behind on a non-scary turn card.

I've always thought to bet all three streets and then decide whether to call if you suspect villain hitting his draw.

What exactly does pot control mean? does it mean betting small on the flop and turn to call down on a cheap river? or does it mean not betting the turn as to keep the pot small?