The Patient Protection and Affordable Care Act (PPACA) – also known as the Affordable Care Act or ACA – is the landmark health reform legislation passed by the 111th Congress and signed into law by President Barack Obama in March 2010. The legislation includes a long list of health-related provisions that began taking effect in 2010 and will "continue to be rolled out over the next four years." Key provisions are intended to extend coverage to millions of uninsured Americans, to implement measures that will lower health care costs and improve system efficiency, and to eliminate industry practises that include rescission and denial of coverage due to pre-existing conditions.