CLOSE Price

The Close is by far the most important price of the four OHLC prices. The Close can be viewed as the summary of the day's trading. The location of the close on the price bar can suggest whether buyers or sellers are in control of the day. When prices close near the high, it can be inferred that buyers won the day; when prices close near the low, it can be inferred that sellers won the day; and when the close is at the center of the price bar, neither side is winning.
The close is useful in its relationship to the high and low, to the day's open, and to the prior day's close. As previously stated, if the close is greater than the open, then the bar is called an "up day". If the close is less than the open, then the day is summarized as a "down day". However, the better measure of a price bar's sentiment (up day or down day) is the close's relationship to the prior day's close. Therefore, if today's close is greater than yesterday's close then the day was an "up day"; and if today's close is less than yesterday's close, then it is a down day. To illustrate why the prior day's close to today's close is superior to the today's open and close, an example is given: The previous day's close is $10, today's open is $15, and today's close is $12. Using the today's close minus today's open, the bar would have been a $3 down day ($12 - $15). However, today's close is $12 and yesterday's close was $10, which would mean today's price action gained $2 ($12 - $10). The gain of $2 is a far better representation of what would have happened if a person owned the stock, namely yesterday a person owned shares at $10/share and today they own shares at $12/share – the shareholder made money.