MacOS Big Sur is the 17th major release of Apple's operating system and was launched on 12 November 2020.
Big Sur is pronounced like the pronunciation of the words big sir.
The name Big Sur is named after the coastal region, which is also named Big Sur, in the Californian central coast. Big Sur derives from the fact that the area was called el país grande del sur in Spanish or "the big country of the south". In 1915, the English name that was subsequently used was Big Sur.