what is test?

A test is a deliberate check that a claim about how something should behave actually holds under defined conditions. In software, tests run code paths to reveal bugs; in science, experiments try to falsify models; in everyday life, a test is a small reproducible check that a belief isn't just noise. Tests aren't proofs, they're filters for signal.

A test is an intentional check that a claim about how something should behave holds under defined conditions. In software, it runs code paths to reveal bugs; in science, experiments falsify models. The value lies in turning beliefs into repeatable observations, not proof; tests are filters for signal, and they guide improvement.