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Introduction.md

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+RxSwift is a Swift implementation of [ReactiveX (Reactive Extensions)](https://reactivex.io): a library for composing asynchronous and event-based programs by using observable sequences.
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+For more information about ReactiveX, see the [Introduction to ReactiveX](http://reactivex.io/intro.html) page.
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+### RxSwift is lightweight
+RxSwift has no external dependencies and works on all Apple's major platforms such as Mac, iPhone, Apple Watch and Apple Tv.
+Its implementation relies on the Grand Central Dispatch library and doesn't include any dependencies to Cocoa, that are, instead, a fundamental part of the extension called RxCocoa. 
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+_Note: The support of Linux is under active development and will be officially added with Swift 3.0._
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+### RxSwift is polyglot
+Rx is well known as a framework and abstraction to work with asynchronous data streams, for this reason this abstraction is available for many different languages: [Rx.NET](https://rx.codeplex.com), [RxJava](https://github.com/ReactiveX/RxJava), [RxJS](https://github.com/ReactiveX/rxjs) and many others.
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+### RxSwift is community driven
+This project has a big community that is growing day by day, helping in creating new extensions and helpers on top of RxSwift, but also contributing to the development of the library itself.
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+If you want to contribute, please read the [dedicated document](https://github.com/ReactiveX/RxSwift/blob/master/CONTRIBUTING.md) and join the [Slack channel](http://slack.rxswift.org) to discuss any potential improvement to the library.
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+The official organization promoting and helping building new extensions for/around RxSwift is called [RxSwift Community](https://github.com/rxswiftcommunity). This organization is a collection of projects part of the RxSwift ecosystem and promotes the quality of projects based on RxSwift.