Ever swipe away phone apps thinking it saves battery? You’re actually breaking the single greatest cheat code in computing: caching. Caching simply means saving completed work so you don't have to redo it later. Just like your phone freezes idle apps in RAM to reopen them instantly, caching allows software to reuse saved results instead of recalculating everything from scratch.
This single principle powers almost every system on the planet. Web servers cache pre-built pages to serve millions of visitors without straining databases. Browsers save heavy images to your hard drive so websites load instantly on repeat visits. Even your CPU chip keeps an onboard cache to avoid waiting for slower memory. In software engineering and daily life, remembering past work will always be faster than starting over.
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