What are the differences between AF-A and AF-C focusing modes in photography?

In Photography, AF-A mode automatically switches between AF-S (single-servo) and AF-C (continuous-servo) focusing modes based on the subject movement. AF-C mode continuously adjusts focus while the shutter button is half-pressed, ideal for moving subjects. AF-A mode is a hybrid mode that automatically selects between AF-S and AF-C depending on the subject's movement.