What is F1 Halo, when it was introduced and how does it save lives?

The Halo prevents large objects and debris from entering the cockpit of a single-seat racing car, and is used in Formula One among other sports. After Zhou Guanyu said it saved his life, we explain why and when Halo was introduced, and how it works.

Formula One: Debate still rages among drivers over introduction of 'halo' head protection system - ABC News

Halo (safety device) - Wikipedia

Verstappen: I thought the Halo was ugly but it saved Grosjean's life · RaceFans

Why do F1 cars have a halo? - Quora

F1 Explained: What is the halo?

The Halo Effect: How The Halo Transformed Formula One – Motorsport Engineer

What is a halo in F1?

Hamilton says halo 'saved my neck' in Monza, and gives his take on Verstappen's penalty

F1 British Grand Prix: What is halo and how does it save lives?

What is the halo? F1 cockpit system explained and why drivers are criticising it

What is F1 Halo? The device that saved drivers Zhou Guanyu and Roy Nissany in horror crashes in F1 and F2 at Silverstone

Lewis Hamilton and Charles Leclerc's lives have been saved by halo, but Toto Wolff has opposed it