Java
Java is a programming language created by Sun Microsystems that offers many benefits to professional programmers and application developers. Java is a byte-compiled language and is completely portable. You can execute the same Java code (or Java class) on a wide range of operating system platforms. Java is much faster than interpreted languages (TCL, Perl, et al), but cannot run as fast as fully compiled languages (C, C++).

Because of its portability, Java and the World Wide Web make an excellent match. Web designers can embed Java applets into their web content for display in Java-enabled browsers like Netscape Navigator and Microsoft Internet Explorer. The applets are downloaded over the Internet within the context of the web document and are then executed on the local computer. Applets can add interactivity, animation, multimedia, or a database interface to an otherwise dull and listless web site.

The Java Virtual Machine is at the heart of the Java programming language. It is the engine that actually executes Java code. You can't run a Java class or Java applet without also running an implementation of the Java Virtual Machine. When Java code is executed, the instructions are not executed directly by the hardware of the local system. Instead the Java Virtual Machine walks through the instructions step by step and carries out the action the instruction represents. This may seem abstract, but it actually provides a level of protection between your computer and the software you run on your computer.

Perl5
Perl is a general-purpose programming language invented in 1987 by Larry Wall. With over one million users worldwide, it has become a language of choice for World Wide Web development, text processing, Internet services, mail filtering, graphical programming, systems administration, and every other task requiring portable and easily-developed solutions.