What is the meaning of Portfolio?

If you own more than one security, you have an investment' Portfolio'. You build the portfolio by buying additional stocks, bonds, mutual funds, or other investments. Your goal is to increase the portfolio's value by selecting investments that you believe will go up in price. According to modern portfolio theory, you can reduce your investment risk by creating a diversified portfolio that includes enough different types, or classes, of securities so that at least some of them may produce strong returns in any economic climate.