A Java applet is a small program that can be embedded in a web page and runs inside a web browser on the client-side. It is written in the Java programming language or another programming language that compiles to Java bytecode and is delivered to users in the form of Java bytecode. Applets are used to provide interactive features to web applications that cannot be provided by HTML alone. They can capture mouse input and also have controls like buttons or check boxes. In response to user actions, an applet can change the provided graphic content, making them well-suited for demonstration, visualization, and teaching. Applets are embedded in an HTML page using the APPLET or OBJECT tag and hosted on a web server. When a user views an HTML page that contains an applet, the code for the applet is downloaded to the users machine. Applets are not stand-alone programs and run within either a web browser or an applet viewer. The Java applet was introduced in the first version of the Java language, which was released in 1995. However, major web browsers began to phase out support for the underlying technology applets used to run, with applets becoming completely unable to be run by 2015-2017. Java applets were deprecated by Java 9 in 2017 and support for running applets in the browser ended in March 2019.