The PZ ABCD Retracement Indicator is a popular and free forex indicator for MT4 that helps traders identify potential trading opportunities by identifying the AB=CD harmonic pattern. The indicator automatically plots Fibonacci retracement levels to help traders identify entry and exit points. It works by scanning the market for the AB=CD pattern and drawing the necessary lines and levels. It can be used by both a novice and an experienced trader, making it a versatile tool for traders who want to improve their trading results.