What is Inspect element; the tool some techies claim they used to buy Coldplay tickets before everyone else

Coldplay will perform in India at DY Patil Stadium, Mumbai in January, 2025. As the ticketing window opened on Sunday noon, some received notifications that tickets for the Jan 18 and 19 concerts had been sold out in 30 minutes. Eventually, the band announced a new show on January 21, 2025. Despite that, many are left frustrated who still are unable to get the tickets.