Adobe Flash Player is a plugin known worldwide and is destined to disappear in favor of HTML5.
This plugin created by Adobe allows you to play flash games on the Internet (eg : Junglokdo), see flash animations that still exist on the Internet, use audio players and / or video created in Flash as dewplayer, ...
System requirements : Windows (32/64 bit) / Mac OS X / Linux / Solaris
Licence : Free
Java is a plugin created by Oracle that has existed for over 20 years. This plugin allows you to create multi-platform programs (such as OpenOffice, programming environments like Eclipse, ...), but also applets that were running in web pages.