DACA stands for Deferred Action for Childhood Arrivals which is a program established by the Obama Administration in 2012 to allow minors who entered the United States and either entered or stayed in the country illegally to have a two-year renewable period of deferred action from being deported from the country. It protects these children from being immediately deported if they are picked up by any of the immigration officials.
There are approximately 800,000 individuals who signed up for the program since it was established. However, President Trump rescinded the program on September 05, 2017 through the Memorandum on Rescission of Deferred Action for Childhood Arrivals. This decision came after he was pressured by several attorneys general who claimed that the program is illegal.