JavaScript is a programming language that is widely used to build web applications. It is a client-side scripting language, which means that it is executed by the user's web browser, rather than on a server. JavaScript is often used in conjunction with HTML and CSS to create interactive, dynamic websites.
JavaScript is based on the concept of objects, which are collections of key-value pairs. These objects can represent real-world objects, such as a car or a person, or abstract concepts, such as a mathematical equation. Objects can have properties, which are the key-value pairs, and methods, which are functions that can be performed on the object.
JavaScript also has a number of built-in objects, such as the Math object, which provides mathematical functions, and the Date object, which provides functions for working with dates and times.
In addition to objects, JavaScript also has variables, which are used to store and manipulate data, and control structures, such as loops and conditional statements, which allow you to control the flow of your program.
Overall, JavaScript is a powerful and versatile language that is widely used to build web applications.
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