Type-Script Classes

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Originally, the rewrite of AngularJS was called "Angular 2", but this led to confusion among developers. To clarify, the Team announced that separate terms should be used for each framework with "AngularJS" referring to the 1.X versions and "Angular" without the "JS" referring to versions 2 and up.[7]

Version 2
Angular 2.0 was announced at the ng-Europe conference 22–23. October 2014.[8][9] The drastic changes in the 2.0 version created considerable controversy among developers.[10] On April 30, 2015, the Angular developers announced that Angular 2 moved from Alpha to Developer Preview.[11] Angular 2 moved to Beta in December 2015,[12] and the first release candidate was published in May 2016.[13] The final version was released on September 14, 2016.

Version 4
On 13 December 2016 Angular 4 was announced, skipping 3 to avoid a confusion due to the misalignment of the router package's version which was already distributed as v3.3.0.[14] The final version was released on March 23, 2017.[15] Angular 4 is backward compatible with Angular 2.[16]

Angular version 4.3 is a minor release, meaning that it contains no breaking changes and that it is a drop-in replacement for 4.x.x.

Features in version 4.3

Introducing HttpClient, a smaller, easier to use, and more powerful library for making HTTP Requests.
New router life cycle events for Guards and Resolvers. Four new events: GuardsCheckStart, GuardsCheckEnd, ResolveStart, ResolveEnd join the existing set of life cycle event such as NavigationStart.
Conditionally disable animations.
Version 5
Angular 5 was released on November 1, 2017.[17] Key improvements in Angular 5 include support for progressive web apps, a build optimizer and improvements related to Material Design.[18]

Version 6
Angular 6 was released on May 4, 2018.[19] This is a major release focused less on the underlying framework and more on the toolchain and on making it easier to move quickly with Angular in the future, like: ng update, ng add, Angular Elements, Angular Material + CDK Components, Angular Material Starter Components, CLI Workspaces, Library Support, Tree Shakable Providers, Animations Performance Improvements, and RxJS v6.

Version 7
Angular 7 was released on October 18, 2018. Updates regarding Application Performance, Angular Material & CDK, Virtual Scrolling, Improved Accessibility of Selects, now supports Content Projection using web standard for custom elements, and dependency updates regarding Typescript 3.1, RxJS 6.3, Node 10 (still supporting Node 8).[20]

Version 8
Angular 8 was released on May 28, 2019. Featuring Differential loading for all application code, Dynamic imports for lazy routes, Web workers, TypeScript 3.4 support, and Angular Ivy as an opt-in preview. Angular Ivy opt-in preview includes:[21]

Generated code that is easier to read and debug at runtime
Faster re-build time
Improved payload size
Improved template type checking
Backwards compatibility
Version 9
Angular 9 was released on February 6, 2020. Version 9 moves all applications to use the Ivy compiler and runtime by default. Angular has been updated to work with TypeScript 3.6 and 3.7. In addition to hundreds of bug fixes, the Ivy compiler and runtime offers numerous advantages:

Smaller bundle sizes
Faster testing
Better debugging
Improved CSS class and style binding
Improved type checking
Improved build errors
Improved build times, enabling AOT on by default
Improved Internationalization
Version 10
Angular 10 was released on June 24, 2020. [22]

New Date Range Picker (Material UI library)
Warnings about CommonJS imports
Optional Stricter Settings
Keeping Up to Date with the Ecosystem
New Default Browser Configuration
Deprecations and Removals
Version 11
Angular 11 was released on November 11, 2020. [23]

Future releases
Since v9, the Angular team has moved all new applications to use the Ivy compiler and runtime. They will be working on Ivy to improve output bundle sizes and development speeds.[24]

Each version is expected to be backward-compatible with the prior release. The Angular development team has pledged to do twice-a-year upgrades.