What are Technical Indicators?Are Technical Indicators Useful?

Humans want to see the future by looking into the past. They set some benchmarks as to what happened in the past after a series of events and then depending on that, they try to predict the future. Technical Indicators in Stock Market is just looking in the past and then try predicting the future. So many people have tried to bring out their own indicators, but the problem with all indicators is that they are lagging indicators. Meaning a price is formed first and then the indicator moves depending on the price. Many a times technical indicators give false signals. There are so many indicators, Stochastic, RSI, MACD, Moving averages etc etc. But none of them is competent enough to give 100% truth. The best technical indicator is the opening price.