Flash the thing to make websites and games.
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It was one of the first programs to make interactive webpages possible without the need for serverside scripting. Opening a lot of possibilities but Flash was installed locally on your computer and had access to the file system. Creating a lot of security risks and it needed a lot of constant updates to keep it safe. Adobe stopped updating the software a while back. So for security reasons it got blocked more and more. There is, as far as I know, not a browser left that supports it.
HTML5 can do almost everything that was possible with flash without the security issues, as long as you make sure you keep updating your browser. HTML5 also works directly in your browser. No need for a third party tool that Flash was.
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