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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>H.4. Extensions</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="external-pl.html" title="H.3. Procedural Languages" /><link rel="next" href="sourcerepo.html" title="Appendix I. The Source Code Repository" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">H.4. Extensions</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="external-pl.html" title="H.3. Procedural Languages">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="external-projects.html" title="Appendix H. External Projects">Up</a></td><th width="60%" align="center">Appendix H. External Projects</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sourcerepo.html" title="Appendix I. The Source Code Repository">Next</a></td></tr></table><hr /></div><div class="sect1" id="EXTERNAL-EXTENSIONS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">H.4. Extensions</h2></div></div></div><a id="id-1.11.9.6.2" class="indexterm"></a><p>
+   <span class="productname">PostgreSQL</span> is designed to be easily extensible. For
+   this reason, extensions loaded into the database can function
+   just like features that are built in. The
+   <code class="filename">contrib/</code> directory shipped with the source code
+   contains several extensions, which are described in
+   <a class="xref" href="contrib.html" title="Appendix F. Additional Supplied Modules">Appendix F</a>.  Other extensions are developed
+   independently, like <span class="application"><a class="ulink" href="https://postgis.net/" target="_top">PostGIS</a></span>.  Even
+   <span class="productname">PostgreSQL</span> replication solutions can be developed
+   externally. For example, <span class="application"> <a class="ulink" href="https://www.slony.info" target="_top">Slony-I</a></span> is a popular
+   primary/standby replication solution that is developed independently
+   from the core project.
+  </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="external-pl.html" title="H.3. Procedural Languages">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="external-projects.html" title="Appendix H. External Projects">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sourcerepo.html" title="Appendix I. The Source Code Repository">Next</a></td></tr><tr><td width="40%" align="left" valign="top">H.3. Procedural Languages </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> Appendix I. The Source Code Repository</td></tr></table></div></body></html>
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