JavaScript is an interpreted programming and script language which is inherit by the Netscape. It is mainly used for to check and create validations on HTML web pages which are most important for all the web based applications. JavaScript is same as general script languages are easier and faster to code in than the more structured and compiled languages such as C and C++. Script languages generally take longer to process than compiled languages, but are very useful for shorter programs. JavaScript is a scripting languages, primarily used on the Web. It is used to enhance HTML pages and is commonly found embedded in HTML code. JavaScript is an interpreted language. Thus, it doesn"t need to be compiled. JavaScript renders web pages in an interactive and dynamic fashion. This allowing the pages to react to events, exhibit special effects, accept variable text, validate data, create cookies, detect a user’s browser, etc. JavaScript is a small and lightweight language. Inside a host environment a web browser, JavaScript can be connected to the objects of its environment to provide programmatic control over them.