Snapshot testing, also known as assertion testing, is a testing technique where the output of a function or component is compared against a previously stored 'snapshot' of the expected output. If the current output matches the snapshot, the test passes. If it doesn't, the test fails, and the developer needs to examine the differences to determine if the change was intentional or represents a bug. It's commonly used for testing user interfaces and data structures where verifying the exact output is important.
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