The PSEi, or Philippine Stock Exchange Index, is a stock market index that tracks the performance of the top 30 companies listed on the Philippine Stock Exchange. It serves as a benchmark for investors to gauge the overall health of the Philippine economy and stock market. The PSEi is calculated based on the market capitalization of its constituent companies, reflecting their stock prices. Changes in the PSEi can indicate trends in investor sentiment and economic conditions, making it an important tool for both local and international investors interested in the Philippines.