Javascript is a programming language which was developed in 1995 -1996 to give behaviour to the website such that we can click on any element of the website and can reach to the content we want .javascript old name was mochera earlier javascript was written on the specific web browser only that is web browser like netscape have it's own javascript code and internet explorer has it's own javascript code at that time same javascript was not able to apply on both the web browser so that the website starts behaving then the ECMA made some rules that javascript can be used for different web browsers and will be common to all.javascript old name was mochera then it was given new name to livescript but the language was not becoming famous so they decided to change it by the name java which was very at that time that how the name javascript came into existence.this language has variables,conditions,values,operators,loops,and functions.using these six basic elements the javascript code can be written that is we can write the code.