When the opponent hits the ball and you identify that it is going to come reasonably close to you, then we make what is traditionally called the split step.
But the phrase split step is very misleading as it describes several different movements.
The moment that you know the ball is coming close you need to make a tiny jump and a wide landing.
The only common denominator of the different movements required to meet the different positions of the ball is the necessity for quick movement.
This is why we label the footwork as “Touch and Go”