What is Cache?
Stored data that loads instantly instead of being fetched again. Often the reason your site feels fast — or why changes do not show up.
Cache is stored data that a computer keeps in an easy-to-reach place so it does not have to recalculate or fetch the same thing over and over. The next time that information is needed, it comes back almost instantly instead of being rebuilt from scratch.
Imagine baking the same cake every week. The first time you hunt through a thick cookbook for the recipe. Write it on a note and stick it on the fridge door and the next bake takes seconds — you have it right in front of you. Cache is that note: a shortcut to something you need often.
Computers and browsers do this constantly. When you visit a website, images and parts of the page are often saved locally so the site loads faster when you return. That is also why you sometimes need to "clear the cache" to see a change — you are looking at the old saved copy instead of the latest version.
Why does cache matter for your business?
Cache is a big part of why a website feels fast or slow. Fast pages keep visitors happier, increase the chance they buy and help you rank better on Google.
Cache also saves money and server capacity. When common pages and images are served from cache, the server does less work and can handle more visitors without becoming slow or expensive.
Cache in practice
Say your homepage shows the same offer to every visitor. Instead of building the page from scratch for each person, the server can save a ready-made version in cache and serve it directly — thousands of times, almost instantly.
The downside: if you just changed a price but still see the old one, cache is often the culprit. Clear the cache and everyone sees the new version. It is a common thing we help clients understand when they wonder why a change has not "appeared" yet.
Common questions about Cache
What does cache mean?
Cache is data stored in a fast, easy-to-reach place so it can be retrieved instantly instead of being recalculated. It is a shortcut that makes computers and websites faster.
What does clearing the cache mean?
Clearing the cache means deleting the saved copy so the computer or browser fetches the latest version again. People often do this when a website change does not seem to show up.
Is cache bad or dangerous?
No — cache is fundamentally helpful and makes everything faster. The only common issue is seeing an old version of a page, which you fix easily by clearing the cache.
Related terms
Serverless
There are still servers — you just do not need to worry about them. Someone else has the headache. You have the app.
API
Application Programming Interface. Think of a waiter who takes your order (request) and brings the food (data) from the kitchen (server).
CDN
Content Delivery Network — copies of your site spread around the world so it loads quickly wherever your visitors are.
Cloud
Someone else's computers. Servers in massive data centres you rent instead of own — AWS, Google Cloud, Azure.
Database
Where all your data lives — users, orders, everything. Lose the database and you lose everything, which is why we back it up.
DNS
The internet's phone book. Translates zorc.se into an IP address so your browser finds the right server.