Adobe Flash Player will reach its end of life (EOL) on January 1, 2021, after always being a security risk to those who have used it over the years. The demise of Adobe’s multimedia software platform was first revealed in a coordinated announcement from Apple, Adobe, Facebook, Google, and Mozilla in July 2017. The decision was taken due to the decreasing numbers of people still using the software and because of more secure and better-performing open tech such as HTML5, WebGL, and WebAssembly being available.
Source: https://www.bleepingcomputer.com/news/security/adobe-flash-player-is-officially-dead-tomorrow/