# Introduction

> [`Tango.Modules`](https://github.com/gabrielschade/Tango/tree/master/Tango/Tango/Modules)

This is one of the most important namespaces at **Tango**. You can find here the core implementations about functional modules, like `Option`, `Either` and `Continuation`.

These modules provides several popular implementations like `Filter`, `Map`, `Reduce`, `Fold`, `Scan` and so on.

By using these modules you can take maximum advantage of [`Either`](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Types/Either/Introduction.html), [`Option`](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Types/Option/Introduction.html) and [`IEnumerable`](https://msdn.microsoft.com/en-us/library/9eekhta0%28v=vs.110%29.aspx) types. A lot of these methods are also exposed as an extension method in `Tango.Linq` namespace, so, you can use it as *static* and instance methods.

this section is a little different than the others. Each method will be explained individually.

In this section you will find the following topics:

* [Option](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Modules/Option.html)
* [Either](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Modules/Either.html)
* [Collection](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Modules/Collection.html)
* [Continuation](https://github.com/gabrielschade/tango/tree/379cc4a38ae47796971eb875ec66e7dc053a9081/Modules/Continuation.html)


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