The MACD is among the most popular indicators. It constitutes and is used as a trend following indicator usually. Some traders like using it use it to spot divergence, it is hard to use in choppy markets.
Developed by Gerald Appel in the late seventies, Moving Average Convergence-Divergence (MACD) is one of the simplest and common indicators used by traders.
RSI is equally common and well used indicator used by range traders.
It is intended to chart the existing and historic strength and weakness of an instrument by working on on the closing prices of a recent trading period.