Javascript refers to a computer programming language used to create interactive effects within web browsers.
For example, javascript allows you to perform calculations, write interactive games, add special effects, check forms, create secure passwords, customize graphics, and so on.
It has become the standard equipment in virtually all web browsers and is well-suited to a large range of non-web-related applications.
Alongside HTML and CSS, JavaScript is one of the three core technologies of the World Wide Web.
