It is a way to have the court review your plea of guilty without having to come to court for a pretrial or trial. The court will make decisions about your case using the same considerations as they would in person or by mailing in a plea form. The offer the court extends through this website is the same offer you would receive in court. It simply takes place through this website.
It is not different. There is a real judge/magistrate and court personnel on the other side, making decisions about your case based on the same criteria they would if you went to court in person. It just takes place through this website.
Some defendants may live far from the court (perhaps in another state), may be incarcerated, may have health issues, or may have transportation challenges and cannot appear in court personally. If you find you are in one of those situations you may want to request to plea through this online program.