A framework uses a logging library (Log4j2, SLF4J/Logback) to record execution details at configurable levels (DEBUG/INFO/WARN/ERROR), aiding debugging and providing an audit trail — far better than scattered System.out.println.
Structured logging lets you record what each step did, at appropriate levels, and route output to console and files with formatting/rotation. Configure levels per environment (DEBUG locally, INFO in CI) so logs are useful without being overwhelming. Log key actions (navigating, clicking, API calls), inputs (non-secret), and failures with context. Logging complements reporting: reports summarize outcomes, logs give the detailed trail for diagnosing a failure. Avoid logging secrets. Replacing println with a logger is a basic but expected framework maturity signal.
logger.info('Navigating to login page') and logger.error('Login failed', e) across the framework produce a readable, level-filtered trail that pinpoints where a failing run diverged — impossible with sprinkled println.
Why is a logging framework (Log4j) preferred over System.out.println in a test framework?