The document discusses security analysis, which refers to analyzing trading securities to understand their risk and estimate their return. There are two main approaches: fundamental analysis and technical analysis. Fundamental analysis involves analyzing economic, industry, and company-specific factors, including financial statements and ratios. Technical analysis focuses solely on historical price and volume data to identify trends and make predictions. While fundamental analysis takes a long-term view, technical analysis uses shorter timeframes like weeks or days to inform trading decisions. Both aim to identify undervalued and overvalued securities.