Hard fork
A rule change that can make blocks valid under the new rules but invalid under the old ones.
In more detail
A hard fork needs coordination because older software may reject what updated participants accept. It can be a planned network upgrade, and it doesn't inevitably create two lasting currencies. A persistent split can happen when groups continue supporting incompatible rules, which is why announcements often explain who needs to update and when.
How you might use it
Node operators install an announced upgrade before activation so their software accepts blocks produced under the new rules.
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