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JS (JavaScript) is a high-level, interpreted scripting language was developed by Brendan Eich in the year 1995.
The core purpose of JavaScript is to make a webpage interactive.
Although there are similarities between JavaScript and Java, including language name, syntax, and respective standard libraries, the two languages are distinct and differ greatly in design. In simple words, JavaScript is a client-side programming language, whereas Java is a server-side programming language.
JavaScript is free for all uses: government, commercial, personal or educational.
To learn JavaScript, you just need to have a basic knowledge of HTML and CSS.