IT Glossary
What is a cache?
Temporary memory that keeps copies of frequently requested data — so websites and applications don’t redo the same work on every visit.
Why does a website load faster the second time you visit? Because your browser kept a local copy of the images and files — that is a cache: the principle of never redoing work already done, applied everywhere in computing. Your website “remembers” its generated pages so it doesn’t rebuild them for every visitor, the customer’s browser holds on to static files, and CDN networks keep copies of your site in dozens of cities. For a business, caching is the number one lever for speed — a well-cached site carries several times more traffic on the same server, and speed translates directly into conversions and Google rankings, which is why it belongs in any conversation about hosting costs or slow pages. The flip side: copies can go stale — hence the classic “I updated the site but nothing changed”, solved by clearing the cache, and hence the rule that time-sensitive data such as stock levels and prices should be cached briefly or not at all.
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Why it matters for your business
Speed without a pricier server
Pages served from cache are delivered orders of magnitude faster — the same hosting plan comfortably carries far more visitors.
Infrastructure costs kept down
Work that isn’t repeated means less processing and less bandwidth — at high traffic, the difference shows up directly on the hosting bill.
Better experience, better SEO
Google measures real page speed; a correctly configured cache is the cheapest point you can score on Core Web Vitals.
Frequently asked questions
I changed my website but the change doesn’t show — why?
Almost certainly a stale cached copy: in your browser, on the site itself or at the CDN. Check in an incognito window; if it looks right there, clear the site cache — and your developer can configure automatic invalidation on publish so this stops recurring.
Can caching show customers outdated prices or stock?
Yes, if configured lazily — pages with dynamic data must be excluded from caching or refreshed on every change. It is a common configuration mistake in online shops, not an inevitability of the technology.
What does the “leverage browser caching” advice in speed tests mean?
Your site isn’t telling browsers how long they may keep static files. Setting those lifetimes correctly — long for images and fonts, short for pages — is a small technical intervention with a visible effect on speed scores.
Let’s talk about your project
Message us on WhatsApp or send an email — you talk directly to a developer.
office@northdan.com · +40 752 070 247