A share/stock that is most active by volumes indicates that the stock has been traded the most. However, most active by volume stocks must be thoroughly analysed before investing i.e an investor must look into the fundamentals, financials and technical charts before investing. Investing in active by volume stocks may sound like a potential opportunity. At the same time you must evaluate the risk associated with it as well. Only considering a day's turnover price may not be a good investing factor.