Single-industry funds (Sector Funds) / specific target fund (Specialty Funds): a single industry fund only invests in a particular industry or sector, such as health care, high technology, recreation, public utilities, and precious metals, since only a particular investment industry, the risk is also relatively high. Fund specific objects such as index funds are scattered in various industries, according to the stock price index fixed for the sampling proportion of stocks, we decided to hold percentage of stocks in the portfolio, when the economic climate is less clear, some fund management companies tend to launch index funds . Specifically refers to a single industry investment in stocks, such as biotechnology, gold, precious metal, regional banks and other funds.