Bowl Championship Series, the former system used to determine college football national champions in the United States from 1998 to 2013.
Acronym formed from Bowl Championship Series, established in 1998 to create a more systematic way to determine college football championships. Replaced by the College Football Playoff system in 2014.
The BCS was both beloved and reviled - it used computer algorithms and human polls to rank teams, but often created controversy when popular teams were excluded from championship games. Its mathematical approach to sports ranking was pioneering but ultimately couldn't satisfy fans' desire for a true playoff system.
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