Java 2 Platform, Standard Edition (Java SE) lets you develop and deploy Java applications on desktops and servers, as well as in today's demanding embedded environments. Java offers the rich user interface, performance, versatility, portability, and security that today's applications require.
The Java 2 Platform, Enterprise Edition (J2EE) defines the standard for developing multitier enterprise applications. J2EE platform simplifies enterprise applications by basing them on standardized, modular components, by providing a complete set of services, and by handling many details of application behavior automatically.
Linux is an operating system that evolved from a kernel created by Linus Torvalds when he was a student at the University of Helsinki. It is a Unix-like computer operating system assembled under the model of free and open source software development and distribution.
The shell is the operating system's command interpreter and the set of commands you use to communicate with the system. It is a way of automating a command sequence inorder to increase productivity.
SEQUEL is special purpose programming language designed for managing data in a RELATION DATABASE. Its loose syntax makes it easy to learn, but mastering its intricate architecture may take a bit longer.