Blink Dagger:

Blink Dagger is a Dota 2 item that lets a hero instantly teleport a short distance to a target point. It is commonly used to start fights, escape danger, or quickly reposition for spells and control abilities.

Because it gives mobility without using mana, Blink Dagger is especially valuable on heroes that need to initiate or reach enemies from close range. It is one of the game’s most recognizable utility items.