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## Chapter 2. Concepts

This chapter introduces some basic concepts that will help you to use Virgo.

## Modular Runtimes and Applications

Virgo Server for Apache Tomcat, Virgo Jetty Server, Virgo Kernel and Virgo Nano are Java runtimes each composed of a collection of modules and supporting applications which are also composed of a collection of modules. Modules can be shared between applications and multiple versions of modules can co-exist.

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