There was a time when Flash was the go-to standard for online content building and support. However, other standards such as HTML5 have outstripped it considerably in the ability to deliver AV and interactive apps of all kinds. Therefore, Adobe has announced a definitive EOL date for this once-ubiquitous relic of the internet.
https://www.notebookcheck.net/The-end-of-2020-is-also-the-end-of-Adobe-Flash-Player.476866.0.html