The answer
So updates produce new filenames and the browser fetches the new version instead of using an old cached file.
Browser Cache and Web Performance Basics
Why do we fingerprint static assets?
More FAQs in Browser Cache and Web Performance Basics
Browser caching is when the browser stores a resource locally so it can reuse it on later requests instead of downloading it again.
Static assets like CSS, JavaScript, images, fonts, and sometimes API responses or HTML depending on cache headers.
It tells the browser how long a resource can be cached and whether it must be revalidated before reuse.
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