# Guide to OpenIG
2.2. How It Works In Detail

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### 2.2.1. OpenIG Core (Reverse Proxy)

OpenIG core is a standard Java EE servlet implementation of a reverse proxy. The main function of OpenIG core is to act as a reverse proxy to the target application. When deployed in its base configuration, OpenIG can be used as a pure reverse proxy. The power of the OpenIG core comes in its ability to search, transform, and process HTTP traffic to and from the target application. This enables OpenIG to recognize login pages, submit login forms, transform or filter content, and even function as a Federation endpoint for the application. All these features are possible without making any changes to the application's deployment container or the application itself.