Fibonacci retracement levels are horizontal lines that indicate where support and resistance are likely to occur. They are based on Fibonacci numbers.

Fibonacci retracement levels are depicted by taking high and low points on a chart, marking the key ratios, and using them in a trend-trading strategy.

Fibonacci numbers are seen in the natural structures of various plants, such as the florets in sunflower heads, areoles on cacti stems, and scales in pine cones.