# Libraries provided by Derby

This section shows the different libraries used by Derby and their purposes.

Engine library

  Library Name | Use
  --- | ---
  derby.jar | For embedded databases. You always need this library for embedded environments. For client/server environments, you only need this library on the server.

Tools libraries
  For embedded environments, you need a library in the classpath to use a tool. For a client/server environment, you need a library on the client only.

  Library Names | Use
  --- | ---
  derbytools.jar | Required for running all the Derby tools (such as `ij`, `dblook`, and import/export).
  derbyrun.jar | Executable jar file that can be used to start the Derby tools.

The Network Server library

  Library Name | Use
  --- | ---
  derbynet.jar | Required to start the Derby Network Server.

The network client library

  Library Name | Use
  --- | ---
  derbyclient.jar | Required to use the Derby network client driver.

The locale libraries

  Library Names | Use
  --- | ---
  derbyLocale_cs.jar derbyLocale_de_DE.jar derbyLocale_es.jar derbyLocale_fr.jar derbyLocale_hu.jar derbyLocale_it.jar derbyLocale_ja_JP.jar derbyLocale_ko_KR.jar derbyLocale_pl.jar derbyLocale_pt_BR.jar derbyLocale_ru.jar derbyLocale_zh_CN.jar derbyLocale_zh_TW.jar | Required to provide translated messages for the indicated locales.

Parent topic: Derby libraries and scripts: complete reference
Related reference
Scripts included with Derby