What is macd and how to use it in trading ?

Moving average convergence/divergence (MACD) is a technical indicator to help investors identify entry points for buying or selling. The MACD line is calculated by subtracting the 26-period exponential moving average (EMA) from the 12-period EMA. The signal line is a nine-period EMA of the MACD line.

Key Tips for Using the MACD Histogram:
Rising Bars Above Zero: Strong bullish momentum.
Falling Bars Above Zero: Weakening bullish momentum.
Rising Bars Below Zero: Momentum is still bearish but weakening.
Falling Bars Below Zero: Strong bearish momentum.