One dot per period
Choose a timeframe first. On a daily chart, each period is one trading day. On a weekly chart, each period is one week. A standard line chart places one dot for each period — usually its closing price — and joins the dots.
Suppose an illustrative share closes at ₹100 on Monday, ₹102 on Tuesday and ₹104 on Wednesday. The chart draws three dots and two connecting lines. It does not draw every trade between them. It does not show the day’s opening price, highest price or lowest price.
In India, the official exchange close is determined under the exchange’s closing process; it need not be the final individual trade you saw on screen. For this lesson, close means the official value recorded for that period by the chosen data source.
What the line answers well
A line chart is good when your question is about direction across many periods. Is the series broadly rising, falling or moving sideways? Because every period becomes one dot, a beginner can read the larger path without first decoding four prices.
It is also useful for comparison. Put an index and a share on the same percentage-change scale and two thin lines are easier to compare than two fields of detailed price marks. Raw rupee lines are misleading when the two assets start at very different prices, so both lines need a common starting point.
The same simplicity helps in a report or presentation where the reader needs the broad movement rather than the anatomy of every session. Less visual detail makes the message easier to scan; it does not make the evidence stronger.
The rule is simple: use a line when one value per period is enough for the decision you are making. Clean is not automatically better. Clean is fewer variables.
Before you choose this chart
- Why use it?
- To remove intraperiod detail and make the broad closing-price path easy to see.
- Who is it for?
- Beginners reading direction, long-horizon readers, analysts comparing normalized series, and anyone preparing a simple report.
- When should you use it?
- Use it when one selected value per period answers the question: broad direction, long-period change, or a clean percentage comparison.
- Why should you not use it?
- Do not use it when the decision depends on the session’s range, opening gap, price extremes, close location or intraperiod behaviour.
- What will you miss?
- The open, high, low, full range, gaps inside the chosen view, order and duration of moves, trade count and volume. Volume can be added separately, but it is not inside the line.
The line rises gently from ₹104 to ₹105 on Thursday. What can you conclude from the line alone?
What disappears between two dots
The range disappears. A day that moved ₹1 and a day that travelled ₹15 can finish at the same closing price. The line makes them look identical at the dot.
The opening price disappears. A share can open far above or below the previous close, then finish back near it. The line joins the two closes and can hide that opening gap.
The sequence disappears too. Even a chart that shows open, high, low and close cannot reconstruct every trade in order; a closing line discards more. If your question is about rejection, intraday pressure or the shape of one session, you need a chart type that keeps those four prices.
Do not ask which chart is best in general. Ask which facts your question needs. Use a closing line for the broad path. Use an OHLC bar or candlestick when the open, high, low and close matter. Changing the chart does not change the market history; it changes which parts of that history you can see.
Would a closing line answer this question?
The line chart has done its job when you can state exactly what it retained and exactly what it removed. Next, keep all four prices without drawing a candle: the OHLC bar.