JavaScript is a dynamic computer programming language commonly used to create interactive effects within web browsers. JavaScript Library is a library of pre-written JavaScript which allows for easier development of JavaScript-based applications. These JavaScript libraries are often called JavaScript frameworks.

 jQuery;

 jQuery is the most popular JavaScript framework on the internet today. It uses CSS selectors to access and manipulate HTML elements on a web page. It also provides a companion user interface framework and numerous other plug-ins. Many of the largest companies on the Web use jQuery such as Google, Microsoft, IBM, Netflix.

 

AngularJS;

 Angular JavaScript allows you to build a complete application, create modules and single page applications and provides you with libraries- it helps you get and bind data, its complex and is based on dependency injections for encapsulation, you need around a year exposure to it- its more popular than knockout JavaScript.

 KnockoutJS;

 Knockout JavaScript - library that handles binding between data and webpage, it doesn’t provide libraries – it is easier to use than Angular JavaScript and can be learnt basically within a week -once you give it the data it will make sure it binds to the relevant data

 Prototype;

 Prototype is a JavaScript library that provides a simple API (Application Programming Interface) to perform common web tasks. IT is a library of properties and methods for manipulating the HTML DOM. Prototype enhances JavaScript by providing classes and inheritance.

 MooTools;

 MooTools is also a framework that offers an API to make common JavaScript programming easier, it also includes some lightweight effects and animation functions.