It appears you're asking about the concept of "caching." In computing, caching is the process of storing copies of files or data in a cache, or temporary storage location, so that they can be accessed more quickly.
When data is cacheable, it means it's suitable to be stored in a cache. Here are a few examples:
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Web browser cache: When you visit a website, your browser stores a copy of the webpage's files (like images, HTML files, and more) in its cache. The next time you visit the same page, the browser can load it faster because it retrieves the files from the cache instead of downloading them again from the server.
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Database cache: Databases often cache frequently accessed data. If the same query is made repeatedly, the database can return the cached result rather than having to compute it again, which saves time and resources.
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Content Delivery Network (CDN): CDNs use caching to store website data at multiple locations around the world. This allows users to load data from the nearest location, improving website speed and reducing latency.
Caching can greatly improve the performance of a system. However, it's important to manage caches properly to avoid serving stale or outdated data. For data to be cacheable, it generally has to be relatively static, requested frequently, and not reliant on real-time updates.
