---
title: Glossary
slug: Glossary
tags:
  - Beginner
  - Glossary
  - Index
  - Landing
  - NeedsTranslation
  - TopicStub
translation_of: Glossary
---
<div style="width: 44%; float: right; margin: 4px 0 .5em 1em; line-height: 1.4;">{{LearnBox({"title":"Learn a new term:"})}}</div>

<p class="summary" style="padding-top: 0; border-top-width: 0;"><span class="seoSummary">Web technologies contain long lists of jargon and abbreviations that are used in documentation and coding. This glossary provides definitions of words and abbreviations you need to know to successfully understand and build for the web.</span></p>

<h2 id="Glossary_of_Terms"><strong>Glossary of Terms</strong></h2>

<p>{{GlossaryList({"split": "h3", "css": "multiColumnList"})}}</p>

<h2 id="Contribute_to_the_glossary">Contribute to the glossary</h2>

<p>This glossary is a never ending work in progress. You can help improving it by <a href="/en-US/docs/MDN/Contribute/Howto/Write_a_new_entry_in_the_Glossary">writing new entries</a> or by making the existing ones better. The easiest way to start is to hit the following link or to pick one of the suggested terms below.</p>

<p><strong><a href="/en-US/docs/new?parent=4391">Add a new entry to the glossary</a></strong></p>

<p>{{GlossaryList({"terms":["at-rule", "ALPN", "Attack", "Byte-Order Mark", "client", "Character set", "cryptosystem", "debug", "digital signature", "execution", "flex-direction", "GLSL", "Interface", "Library", "Memory management", "routers", "Self-Executing Anonymous Function", "Stylesheet", "Vector image"], "filter": "notdefined", "css": "multiColumnList"})}}</p>

<p>If you want to know more on how to contribute to the glossary, check out <a href="/en-US/docs/MDN/Doc_status/Glossary">the glossary documentation status page</a>.</p>

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="/en-US/docs/MDN/Community">Join the MDN community</a></li>
</ul>

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<h2 id="Subnav">Subnav</h2>

<section id="Quick_Links">
<ol>
 <li><strong><a href="/en-US/docs/Glossary">MDN Web Docs Glossary</a></strong>{{ListSubpagesForSidebar("/en-us/docs/Glossary", 1)}}</li>
</ol>
</section>
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