2. Concepts
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## 2. Concepts

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

## 2.1 Modular Runtimes and Applications

Virgo Tomcat Server, Virgo Jetty Server, and Virgo Kernel 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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1.2 A Note for Virgo Jetty Server Users | Home | 2.2 OSGi Concepts