Slats are typically UN-powered devices on the leading edge that extend
simply by the reduced dynamic pressure against them as airspeed slows.
Example would be the leading edge extensions of the F-86 and F-100.

I wouldn't agree with "typically." Aero slats also extend when a certain
AOA is achieved ... the A-4 slats would extend at approximately 12 units AOA
(IIRC) and bringing them out symmetrically at higher airspeeds was not a
sure thing.

Grumman liked powered slats. Both the A-6 and F-14 had them.

R / John