BBC Sport explains the halo device — the titanium structure mounted above Formula 1 cockpits that has saved multiple lives since its introduction in 2018. The explainer covers how the halo works, the resistance it faced during development, and the dramatic incidents where it proved its worth. With Browning's recent Suzuka crash fresh in memory, the article serves as a timely reminder of why the halo is considered one of F1's most important safety innovations.