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+A _Bridge_ is an class that allows **RSS-Bridge** to create an RSS-feed from a website. A _Bridge_ represents one element on the [Welcome screen](Screenshots) and covers one or more sites to return feeds for. It is developed in a PHP file located in the `bridges/` folder (see [Folder structure](Folder-structure)) and extends one of the base classes of **RSS-Bridge**:
+
+Base class | Description
+-----------|------------
+[`BridgeAbstract`](BridgeAbstract) | This class is intended for standard _Bridges_ that need to filter HTML pages for content.
+`HttpCachingBridgeAbstract` | This class an extension of `BridgeAbstract`, allowing caching of files downloaded over HTTP files.
+`RssExpander` | This class is an extension of `HttpCachingBridgeAbstract`, designed to load existing RSS 2.0 feeds into **RSS-Bridge**
+
+For more information about how to create a new _Bridge_, read [How to create a new Bridge?](How-to-create-a-new-Bridge%3F)
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