Blinking, also known as flickering, temporarily exiles a permanent before returning it to the battlefield. It's most commonly used on creatures to reuse enter-the-battlefield abilities, remove unwanted Auras or counters, or dodge removal.
Powerhouse utility spell Ephemerate can blink a creature twice thanks to its rebound keyword, Soulherder repeatedly blinks creatures at your end step, and Thassa, Deep-Dwelling provides an indestructible God creature that blinks one creature per turn.