Angular is a popular JavaScript framework for building web applications. It was first released in 2010 by Google and has since become one of the most widely used frameworks for building dynamic and responsive web applications.

Here's a brief history of the different versions of Angular:

AngularJS (1.x): AngularJS, also known as Angular 1.x, was the first version of Angular. It was released in 2010 and quickly gained popularity among developers. AngularJS was built using JavaScript and was designed to make it easier to create dynamic web applications. It introduced many concepts that are now core to Angular, such as directives, two-way data binding, and dependency injection.

Angular 2: Angular 2 was released in 2016 and was a complete rewrite of AngularJS. It was built using TypeScript, a superset of JavaScript, and introduced many new features and improvements, including a more efficient change detection mechanism, a modular architecture, and better performance. Angular 2 also introduced the concept of components, which are now a core part of the framework.

Angular 4/5/6/7: Angular 4, 5, 6, and 7 were released between 2017 and 2018. These versions focused on improving performance, reducing the size of the framework, and adding new features. Some of the key features introduced in these versions include the introduction of the HttpClient module, which made it easier to make HTTP requests in Angular, and the introduction of the Angular CLI, which is a command-line tool for generating and managing Angular projects.

Angular 8/9: Angular 8 was released in 2019 and introduced many new features, including improved lazy loading, differential loading, and improved performance. Angular 9 was released in 2020 and was primarily focused on improving the performance and size of the framework. It also introduced a new Ivy rendering engine, which improved the performance of the change detection mechanism.

Angular 10/11/12: Angular 10, 11, and 12 were released in 2020 and 2021. These versions focused on improving the developer experience, improving performance, and adding new features. Some of the key features introduced in these versions include strict mode, which helps to catch more errors at compile-time, and the introduction of the component harness, which makes it easier to test Angular components.

Angular 13: It was released on 3 November 2021. Supports typescript 4.4. It has inline support for Adobe fonts and IE 11 support removed. RxJS v7.4 is the default for applications built with ng new command.

Angular 14: Angular 14 is one of the most systematic pre-planned upgrades of Angular. Angular 14 comes with typed reactive forms, CLI auto-compiled, directives, and a developer preview of standalone components.

In conclusion, Angular has come a long way since its initial release in 2010. With each new version, it has introduced new features and improvements that have made it easier and more efficient to build dynamic and responsive web applications. If you're a developer looking to build modern web applications, Angular is definitely worth considering.