When day trading, a trader makes the decision about what to trade, when to trade, and how to trade, using either fundamental or technical analysis. Both forms of analysis involve looking at the available information and making a decision about the future price of the market being traded, but the information that is used is completely different. It is possible to use both fundamental and technical analysis together, but it is more common for a trader to choose one or the other.
Technical analysis is a method of forecasting price movements by analyzing statistics generated by market activity, such as previous prices and trading volume using charts and mathematical indicators to identify patterns that can suggest future activity, as it is based on the belief that the historical performance of stocks and markets are indications of future performance.
Despite the technical tool that is used, technical analysis actually studies supply and demand in a market in an attempt to determine what direction or trend will continue in the future by studying the market itself.
Almost every trader uses some form of technical analysis. Even fundamental analysis traders are likely to glance at price charts before executing a trade, as these charts help traders determine ideal entry and exit points for a trade. They provide a visual representation of the historical price action of whatever is being studied.