What is the difference between Angular 2 and Angular 4?

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Angular 4 is the latest version of Angular. Although Angular 2 was a complete rewrite of AngularJS, there are no major differences between Angular 2 and Angular 4. Angular 4 is only an improvement and is backwards compatible with Angular 2.
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There are additional functionalities and bug fixes in the latest angular version. Also, there is a performance improvement of controls.
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