Technical Analysis and Fundamental Analysis are the two primary schools of thought for evaluating investments. Technical analysis studies historical price and volume data using chart patterns and indicators to predict future price movements, while fundamental analysis evaluates a company's financial health, earnings, and broader economic conditions to estimate its intrinsic value.
Investors compare the two because they operate on different timeframes and answer different questions — technical analysis helps with the “when” of a trade, while fundamental analysis helps with the “what” and “why” of an investment.