Let us look into stock trading volume and try to get a clear picture of what it is and how it helps in trading or the impact it has on stock market. The most basic definition of trade volume is the interest shown in a particular stock. Thus, if there is an increased interest, it means that there is an increased volume. This works the other way too, when volume increases the interest too grows. This is indicative of a large number of traders buying and selling these stocks or few of them trading the shares in large numbers.

Thus, volume is the number of shares that are traded in a given period of time in the entire market. Hence, if there is a purchase of 100 shares then the volume increases by 100 shares for that time period on the basis of that particular transaction. Measure of volume is indicative of the market movement's worthiness.  A move in the upward or downward direction is measured in strength by volume recorded in that period of time. The significance of the move is greater if its volume is higher.

Monitoring daily volume comes handy since, you can track mutual funds and hedge funds trading big positions. Thus, there is an increased awareness of liquidity of market. Daily volume is the number of shares traded in the market in one working day for a specific stock. Thus, every time this stock is traded, it is added to the total daily tally of stock. This can also be used to calculate the average daily volume. This measure gives traders the average number of shares a particular stock trades per day. Sometimes, volume is measured for the week or month too, depending on the stock that is being traded.

A large change in volume also indicates a significant change in the price of a specific stock. If there is a measured increase in volume of a stock four times in one year, it follows that this corresponds to quarterly statements issued for company. Thus, increase in earnings would lead to increased trading of stock, while losses lead to dumping of stocks. Increased volume is mainly indicative of important events taking place. Like for example, if there is a prediction of increase in corn crop but it is unfortunately followed by rains and floods, there is an immediate increase in volume as investors and speculators rush to buy corn futures at an increased price.

Stock trading volume has unexplained spikes when large trades have been performed by institutions and these do not appear in earnings reports or news cycle. Even though stock trading volume is a valuable indicator of stock market movements, the average investor is unaware of benefits of following and monitoring it, but it is indicative of investor sentiment, institutional trading, and important market events, which are useful in maximizing profits.