The Java runtime forces all Java programs to run in what's called a "sandbox", a portion of computer memory to which they are strictly confined. Java is touted as a secure computing environment, one that makes it difficult for bad guys to snoop, cripple, or take over your computer. Java applications can be embedded in web pages, cell phones, industrial controls, household thermostats, even coffee makers. Java is handy for programmers they need only write a program once and not worry about whether the user has a PC or a Mac computer, or be concerned with which browser is being used. That's where the Java runtime environment becomes necessary.
Essentially, that means a program written in the Java programming language will run on any type of computing platform, not just on an Intel or Apple or Nokia piece of hardware provided, of course, that the essential Java operating components are present. Java consists of many software components that work together to provide a "cross-platform environment".
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Java is a both a programming language and a platform for development of applications that work on multiple operating systems, such as Windows or Mac OS or Linux. But what is Java, and why should you install or enable it? Even cell phones commonly push Java at users. Many sites will provide a helpful link to where you can download the Java runtime environment. If you encounter a website with an embedded Java app, and you don't have Java installed (or enabled), you'll just see an empty space where the program (applet) should be displaying.
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