The Keystone Pipeline is a system of pipelines that transports crude oil from Canada to various locations in the United States. It consists of several phases, with the most notable being the Keystone XL, which was proposed to extend the pipeline further south. The pipeline aims to connect oil sands in Alberta, Canada, to refineries in the U.S., enhancing energy security and economic growth. The project has faced significant controversy and debate over environmental concerns, particularly regarding its potential impact on ecosystems and water sources. Supporters argue it creates jobs and boosts energy independence, while opponents highlight risks associated with oil spills and climate change.