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On Tuesday, the Supreme Court finally heard arguments over the future of Deferred Action for Childhood Arrivals, or DACA, a program that has kept roughly 700,000 young, unauthorized immigrants in limbo for years.

Here’s what you need to know:

Need a refresher on DACA and Dreamers?

In 2012, President Barack Obama introduced the program, which shields people who were brought to the United States as children from deportation. It was intended as a stopgap measure, and didn’t provide a pathway to citizenship.

But it did allow participants, known as Dreamers, to get work permits, and in some states, including California, to access in-state tuition and legally drive. Dreamers can renew their status in two-year intervals.

Recipients who aren’t veterans have to be enrolled in high school or have a diploma or G.E.D. and cannot — contrary to what President Trump has said — have a serious criminal history.