The delta robot is a parallel robot with various arms joined together at the end effector. Typically it has 3 degrees of freedom (XYZ), although some models have an additional rotary axis.
The delta’s strong points are speed and stiffness: since the arms are very light, it can accelerate and move very quickly. The multiple connected arms add stiffness, but they also reduce the work envelope.
The delta robot is typically mounted above the work area.
Delta robots are popular for packaging and other high speed pick and place type operations.