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What Is Cache?
Performance
Updated 18 September 2026
Quick Answer
A cache is a temporary storage location that saves a copy of website data — so it loads faster on repeat visits, since the browser doesn't need to re-download everything from scratch.
Cache vs. Cookie — What's the Difference?
| Cache | Cookie | |
|---|---|---|
| Purpose | Stores files for faster loading | Stores small pieces of data to remember visitor information |
Why It Matters
- It's a significant factor in page speed, particularly for returning visitors.
- Understanding caching helps troubleshoot a common confusing issue: a website change that doesn't appear to have taken effect, because a cached older version is still being shown.
How It Works
- A browser (or server) saves a copy of website files after the first visit.
- On repeat visits, it loads from that saved copy instead of re-downloading everything.
- The cache is periodically refreshed or manually cleared when content actually changes.
Key Takeaways
- A cache stores files temporarily for faster repeat page loads.
- It commonly explains why a fresh website change doesn't appear immediately.
- Most platforms manage caching automatically.
Frequently Asked Questions
Why don't I see my website changes after publishing them?
A cached version of the old page might still be showing — try clearing your browser cache or viewing in a private/incognito window.
Does caching help or hurt SEO?
It generally helps, since faster page load times are a positive ranking factor.
Do I need to manage caching myself?
Most modern hosting and website platforms handle this automatically, though it's useful to know how to clear a cache when troubleshooting.