The peripheral market generally refers to the American stock market in the stock market. Under the background of globalization, the trend of US stocks also has great influence on other stock markets in the world. When the external market is red, the domestic stock market often follows the upward trend; Conversely, when the external market is green, the domestic stock market will also fall. Therefore, it is very important for investors to understand the trend of the external market.

In addition to the US stock market, the external market can also refer to the stock markets of other countries and regions. For example, European stock markets and Asian stock markets. Different stock markets have different trends, which are influenced by the economic and political factors of their respective countries and regions. Therefore, it is equally important for investors who want to make international investments to understand the external market trends of different countries and regions.

In short, the external market refers to the external trend of the stock market, which has a very important impact on investors' investment strategy and risk control. To this end, investors need to understand the market dynamics and be familiar with the macroeconomic situation of various countries and regions, even including political information. Only when investors fully understand this information can they make correct decisions and deal with their portfolios reasonably.