2. Angular

TypeScript based framework or development platform used for building dynamic web applications.
TypeScript is statically typed programming language which is superset of JavaScript.
Statically typed means variables, parameters and functions are associated with their types at compile time. Type checking is performed during compiled time before the execution of the code.
Framework is the collection of pre-written codes, library and tools that developers can use to build application more easily and efficiently.
Dynamic web page means that the content of the webpage can change in real time without the need for the user to reload the page.
Open-Source TypeScript-Based framework.
Invented by Google Developers Misko Hevery and Adams Abrons.

Misko Hevery and Adams Abrons

Maintained by Google
Component based framework. Components are building block for building user interface. There are Three basic component.

Template : Html code that define the UI for component.
Class: TypeScript code that provide logic for the UI.
Decorator: TypeScript syntax that provides metadata about component like selector or any dependencies.

Used for developing client side application. which means angular code runs on users web browser on client side and is responsible for rendering and manipulating user interface.
Follows Model-View-Controller (MVC) architecture pattern
Includes wide range of features such as dependency injection, routing, testing ,etc.
Model: Represents data and business logic of the application.
View: Represents User Interface of the application. Responsible for displaying data to the user and receiving user input.
Controller: Acts as an intermediary between the model and the view.
In MVC each component can be developed independently, and changes made in one component do not affect the others.
Websites built using Angular are

Angular