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It is closely related to Tampering, and focuses on resistance, damage containment, and detection.
What to Watch in Practice
Tamper resistance does not mean perfect immunity. In practice it is easier to think of it as a bundle of design choices that raise the cost of modification, reduce the value of a successful change, and increase the chance of detection.
That is why the topic is bigger than obfuscation alone. Key placement, verification points, and what should happen after a tamper signal all shape whether the system is actually resistant.
Practical Note
Tamper Resistance usually appears in contexts related to security, tampering, hardware, software. In practice, it helps to know not only the definition, but also what this term is trying to name quickly in a conversation, design note, or document.
Nearby words often overlap and make the explanation fuzzy. It is easier to use the term well when the target, role, and typical situation are kept one step more concrete.
Reading Note
The easiest way to read this term is to look at three things first: what it is about, what nearby concept it should be separated from, and what kind of decision it usually supports. For Tamper Resistance, the security, tampering, hardware, software context is already a good starting point.
It also helps not to stop at the definition alone. The more useful view is to see what the term is trying to name quickly inside a working conversation.