What MACD is made of
MACD has three parts. The MACD line is the 12-period EMA minus the 26-period EMA. The signal line is a 9-period EMA of that MACD line. The histogram is the gap between them (MACD minus signal).
Read it simply: when the MACD line is above zero, short-term momentum is stronger than longer-term — broadly bullish; below zero, broadly bearish. The histogram shows that momentum building or fading.
Crossovers — and why they lag
The classic signal: MACD crossing above the signal line is read as bullish, crossing below as bearish. Useful, but remember it's built from moving averages, so it always lags price.
In a strong trend, crossovers can be helpful confirmation. In a choppy, sideways market they whipsaw — firing buy and sell signals that both lose. Knowing which regime you're in matters more than the cross itself.
Divergence is the higher-value signal
The most useful MACD read is divergence: price makes a higher high while MACD makes a lower high (momentum fading under a rising price — bearish divergence), or the reverse at lows.
Treat it as context, not a trigger. Combine MACD with structure (support/resistance), the prevailing trend and your risk plan — and never size a trade off MACD alone.