In computing, a cache is temporary storage that keeps copies of frequently accessed data so it can be retrieved faster than fetching it from the original source. Web browsers cache website files so pages load quickly on repeat visits. Computers cache data in fast memory to avoid slower disk reads. When you 'clear your cache,' you delete this temporary data, which can fix display problems but may make pages initially load slower. Caching improves performance but can sometimes show outdated information. Understanding caching helps when troubleshooting why a website shows old content—the cached version may differ from the current version.