Final answer:
A Java program that runs inside a web page is called an applet. Applets have become less common with the introduction of modern web technologies that offer similar features without the need for additional plugins.
Step-by-step explanation:
A Java program that is designed to execute inside a web page is called an applet. Applets were introduced in the early days of the internet as a way to provide interactive features to web pages by embedding small programs. However, with the advancements in web technology, the use of applets has declined because modern web standards like HTML5, CSS3, and JavaScript offer similar functionalities natively in web browsers