edge caching
Edge caching stores copies of your content in data centers spread around the world, close to where your visitors actually are. Instead of every request travelling back to one central server, the response comes from a nearby location, which cuts load time and smooths out performance. It matters most once your audience is spread across regions or your traffic climbs high enough that the single origin server becomes the bottleneck.
Also known as: CDN caching, edge cache, CDN edge, edge nodes
Where this term comes up
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Glossary entries are a starting point. The real question is usually what to do about the thing once you understand it.
When you are ready to go further, the related guides take this from definition to fix.
And if you would rather just ask a person, I read everything that comes to christopher@thisismyurl.com.
I have been working in WordPress since 2007, so most of these terms come with a story.
Still mapping the basics? The full glossary is here whenever you need it.