Technical analysis examines past market action and previous trends and uses that data to predict the future.

Past trends in most areas of life are almost always good indicators of the future; forex is no different. People have not changed much in the decades since the forex market was created. People still buy and sell and react to stimuli in much the same way as they did 50 years ago.

Since forex rates change constantly throughout the day, every day, looking at all the years of past data can be daunting. Smart analysts learned to look at the big picture, to skip the minor details and examine trends over a longer period of time.