Cache busting changes a resource identifier or version reference so a client requests a new resource instead of reusing an older cached copy under the previous identifier. It is useful in controlled website or application publishing workflows. It is different from deleting every cache or adding arbitrary parameters to a private stream whose server expects a precise address.
A practical example
A site can publish a new stylesheet with a versioned filename and update its page references. Browsers then request the intended new file while existing cached files can remain harmless, without customers needing to erase unrelated account or player data from their devices.
A common misunderstanding
Do not append random characters to playlist or media URLs as a universal refresh trick. Unknown parameters or changed signatures can invalidate private access rather than safely updating cached information.
Related terms
Stable technical definition. Editorial approach