console.assert() is a specialized debugging tool: 1) It evaluates a condition and logs an error message only if the condition is false, 2) It takes the format console.assert(condition, message, ...args), 3) When the condition is true, nothing happens - no output is produced, 4) This allows placing assertions throughout code that only appear when conditions fail, 5) It reduces console noise by only showing relevant failures, 6) Unlike traditional assertions in other languages, it doesn't throw exceptions or stop execution, 7) This makes it safe to leave assertions in production code, 8) It's particularly useful for validating assumptions about program state during development and debugging.