Prosecutorial Discretion is when a prosecuting government attorney or organization can influence a case. Organizations such as the U.S. Immigration and Customs Enforcement (ICE) can use prosecutorial discretion in immigration law. Also, USCIS and Customs and Border Patrol have been known to exercise prosecutorial discretion.
Prosecutorial discretion can affect if you stay in the country or if you are ordered out of the U.S. It can provide relief for people who have no other options to prevent deportation.