The Williams Accumulation Distribution indicator is a useful forex indicator that is popular among MT4 traders. It is free to use and provides valuable insight into the accumulation and distribution of a particular currency pair. The indicator works by indicating the strength of buying and selling pressure in the market, helping traders to identify potential trend reversals or continuations. It can be used to confirm the strength of a current trend or to spot potential entry and exit points. Overall, the Williams Accumulation Distribution indicator is a valuable tool for forex traders looking to make more informed trading decisions.