This will allow the first stage to be brought back to Earth safey, to land on a landing pad and to be reused. On this flight, they will not try to land the first stage, But they will soon.
Yes, for the first time in human history, a rocket that can be reused. Space-X- hopes to be able to do this perhaps 100 times. This reduces the cost of getting tnto space a lot if it can be done routinely.
Perhaps down to $10 a pound! That will change everything.
But we need to see some successful experiments with the technology. They expect only a 30% chance of success today. Keep your fingers crossed.