Glossary termify server-side rendering and update definition.

Author: stevepiercy

docs/glossary.md

@@ -212,13 +212,20 @@ Express
     A JavaScript HTTP server with a simple API to build custom applications.
     Volto uses it as its server.
 
-Server-Side Rendering (SSR)
-    When first loading any Plone page, users will get HTML markup that closely matches the final DOM structure of the React components used to render that page.
+SSR
+server-side rendering
+    When first loading any Plone page, SSR will send HTML markup that closely matches the final DOM structure of the React components used to render that page.
 
-Single Page Application (SPA)
+    More generally, when a client sends a request to an SSR page, the HTML for the page is created on the server on each request.
+    SSR enables a developer to customize a website per request and per user.
+    In addition, SSR can improve performance and search engine optimization (SEO) for a website.
+
+SPA
+Single Page Application
     A type of JavaScript application that aims to provide a better user experience by avoiding unnecessary reloading of the browser page, instead using AJAX to load backend information.
 
-Hot Module Replacement (HMR)
+HMR
+Hot Module Replacement
     A development feature provided by Webpack that automatically reloads, in the browser, the JavaScript modules that have changed on disk.
 
 Yeoman

docs/overview/index.md

@@ -74,7 +74,7 @@ Plone is easy to set up compared to other CMSs in its category, extremely flexib
 Plone is a content management platform with its backend written in Python.
 It is built on top of the open source Zope web application server and development system. 
 Plone makes use of the pluggable Zope Component Architecture (ZCA) to provide a highly modular and extensible system.
-Throughout its history, Plone has used server-side rendering to generate HTML-based content, with advanced resource management features for adding and bundling CSS and JavaScript. 
+Throughout its history, Plone has used {term}`server-side rendering` to generate HTML-based content, with advanced resource management features for adding and bundling CSS and JavaScript. 
 Additionally, Plone's use of a component architecture makes it easy to extend and customize, allowing users to create unique, feature rich websites that are tailored to their specific needs.
 
 With the release of Plone 6, you now have the option to choose from two different out-of-the-box supported configurations when setting up a new Plone website.