Deferred Action for Child Arrivals is a program created in 2012 during the Obama Administration. It allows hundreds of thousands of immigrants, brought to the US illegally as children, to remain in the country. Recipients of the program cannot have serious criminal histories and must have arrived in the US before 2007. Further, they must pay a fee every two years to live and work in the US. Recipients are also ineligible for public assistance programs.
The Trump Administration has recently announced that the executive is rescinding the program.
Quoted from Consideration of Deferred Action for Childhood Arrivals from the USCIS:
An applicant must fill out these three forms for eligibility in the program:
The fees total $495, a $410 fee for Form I-765 and a biometric services fee of $85.