One common distinction between a scripting language and a language used for writing entire applications is that, while a programming language is typically compiled first before being allowed to run, scripting languages are interpreted from source code or bytecode one command at a time. Scripting languages are not compiled to machine code by user like other programming languages. They are high level code which are interpreted by another program dynamically or at runtime. Scripts are set of instructions either to the web browser (client side)which are embedded in HTML, or to the server side that interface to databases or other data stores on the server. A scripting language can be viewed as a domain-specific language for a particular environment; in the case of scripting an application, this is also known as an extension language. Scripting languages are also sometimes referred to as very high-level programming languages, as they operate at a high level of abstraction, or as control languages, particularly for job control languages on mainframes. Scripting languages are programming languages that don’t require an explicit compilation step.

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• Java bytecode can be written once and then run on multiple platforms. Java bytecode does not need to be ported to a specific hardware environment because it runs in the Java Virtual Machine.
• Java was written with security in mind. The Java Virtual Machine has built-in security features that allow programmers to write highly secure Java programs. It also prevents malicious software from compromising the Operating System (OS) because it keeps Java applications from interacting with Operating System resources.
• Java programs that run on a Java Virtual Machine tend to perform slower than equivalent programs written in C++. The system neutrality of  bytecode acts as a disadvantage where performance is concerned. This is because code optimization relies heavily on system-specific features. Since Java bytecode is system-neutral, it cannot be optimized for a specific hardware set.
• A program that performs, as expected, is said to be correct. Since a Java program relies on the Java Virtual Machine to execute it, the JVM must be free of errors for the program to operate correctly. Luckily, the Java Virtual Machine software is produced with very high standards, and therefore it isn’t likely to ship with any errors.

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