The bar chart (OHLC)

The line chart is peaceful, but it has a fatal blind spot: it quietly assumes the trip from yesterday's close to today's close was a straight, calm walk. It rarely was.

Say a stock closed at ₹100 yesterday and ₹105 today. The line chart draws a small, cheerful up-tick and moves on. But suppose today it actually opened at ₹100, crashed to ₹50 on a false report of fraud, then rocketed back to ₹105 when the company denied it an hour later. The line chart shows none of that. The crash, the panic, the recovery - all erased, replaced by a tidy green step. A holder who lived through that day would not recognise the chart of it.

So the question for this module is the exact opposite of the last one. Instead of asking what we can safely throw away, we ask: how do we keep the whole day - the violence and all - without the chart collapsing into an unreadable mess?

The bar chart exists to cure the line chart's amnesia. It records the full boundary of the day's fight by keeping all four prices that summarise a session - the four numbers known together as OHLC:

1. Open (O): the first traded price of the period.
2. High (H): the highest price anyone was willing to pay.
3. Low (L): the lowest price anyone was willing to sell at.
4. Close (C): the final agreed price when the bell rang.

Those four points fence in everything the day did. The high and low mark how far the fight ranged; the open and close mark where it started and where it settled. Nothing is averaged, nothing is smoothed - the bar is a faithful record of the extremes and the endpoints. For over a century, before candlesticks reached the West, this was the chart of serious analysis.

There is a subtle honesty in that fence of four numbers. The bar does not pretend to know the path price took between the corners - it claims only the corners themselves, which are facts the exchange recorded. Everything a sound reading of a bar can say stays inside those four measured points. The moment you catch yourself narrating the journey - "it must have dived and then recovered" - you have stepped out of what the bar knows and into what you are guessing. Keeping that line clear is half of reading any chart honestly.

A single day is drawn as one vertical line with two small horizontal ticks. The picture is worth reading slowly, because every later chart type is a re-drawing of these same four numbers.

Read it as a rule you can apply in half a second: left tick is the Open, right tick is the Close. If the right tick sits higher than the left, buyers won the day. If it sits lower, sellers won. The height of the vertical line tells you how hard the fight ranged; the gap between the ticks tells you how much ground actually changed hands by the close.

Now build both cases yourself. The playbook assembles the four points into a positive, buyer-won bar first, then a negative, seller-won one - watch where the ticks land in each.

One more reading habit pays off immediately: compare each bar to the one before it. A bar whose whole range sits above the previous bar's range shows buyers stepping up with urgency; a bar that opens inside the last bar and closes below its low shows momentum draining away. You rarely trade a single bar in isolation - you read the conversation between consecutive bars, and the ticks are the words.

Once you can read one bar, the shape of a bar tells you what kind of session it was - no numbers required.

• The small, tight bar. Open and close nearly together, high and low not far off. A mature FMCG name on a sleepy Tuesday. Nobody is fighting; the stock is resting.
• The tall vertical bar. A vast distance from high to low - a small-cap the day it reports earnings, with buyers and sellers brawling over what it is worth. The height is the argument.
• The bar with ticks at the top. A close pinned near the high after a wide range says buyers seized control into the bell and held it. It is the market's way of ending the day with the buyers' flag planted.
• The bar with no ticks and no line. A single dot - open, high, low and close all equal. A stock locked in an upper or lower circuit that opened at its limit and never moved. The absence of a bar is itself the signal.

Reading a run of these in sequence is how a trader senses whether a market is calm, fought-over, or one-sided - before reaching for a single indicator.

Candlesticks have largely replaced bars on retail screens, but the OHLC bar is not a museum piece - it wins in a few specific conditions worth knowing.

On very long, dense charts - years of daily data crammed onto one screen - thin bars clutter less than fat candle bodies. A reader studying decades of an index sometimes prefers bars precisely because each one uses less ink, letting more history fit before the chart turns into a wall of colour.

Across timeframes, the same bar means different things. A weekly bar's range is a whole week's high-to-low fight; a five-minute bar's range is a five-minute skirmish. The drawing is identical, but the story it carries scales with the period. A tall weekly bar is a major event; a tall five-minute bar may be nothing but a fleeting spike. Always read a bar's height relative to the timeframe it belongs to, never in the abstract.

In the Indian market, the circuit filter gives the bar a distinctive signature. A stock that opens straight into its upper circuit and stays there prints a bar with no range and no ticks - a single point. A string of such points climbing the chart is the visual fingerprint of a stock locked limit-up day after day, unable to find a two-way market. No indicator is needed to spot it; the collapsed bars say it plainly.

The honest summary: bars and candles carry the exact same four numbers, so neither reveals more information than the other. The choice between them is only about which drawing your eye reads faster for the job in front of you.

The bar keeps four numbers, but it cannot keep the order they arrived in - and that gap matters more than beginners expect.

Picture two days with identical bars: same open, high, low and close. On the first, the stock hit its low at 9:20 AM in a brief panic, then climbed steadily all day to close near the high - a story of strengthening. On the second, it opened, ran straight to the high, then bled lower for hours before a last-minute bounce dragged the close back up - a story of weakness papered over at the end. The bar is identical in both cases. The path is deleted; only the four corners remain. Any tale you tell about the intraday sequence from a daily bar is inference, not data.

A bar also carries no volume on its own. Two bars can look identically strong - the same close pinned at the same high - while one was built on heavy, committed buying and the other on a handful of thin trades. The bar shows the price outcome, never the weight of money behind it. That is why, later on this shelf, volume is read alongside the bar and never assumed from its shape.

The bar also cannot tell you what happens next. A close at the high is real evidence about today and nothing more. A strong bar shifts the odds a little; it never settles them. And, like every chart on this shelf, a bar records what the crowd did with the price, which is not the same as what the business is worth. The bar maps the day's trading, not the company behind it.

The most seductive bar is the one that closes right at its high. Because the right tick sits at the very top, the eye reads it as pure strength - and beginners buy the next morning expecting more of the same. But a bar is a finished battle, and a rush to the high has two honest readings.

The repair is the habit that ends every reading on this shelf: name, in advance, what would change your mind. If the very next bar opens lower and closes below this bar's low, the 'buyers in control' story is finished, and the strong close was one day's noise. Decide that exit before you act, or you were never reading the bar - only hoping.

Western traders squinted at these blurry ticks for decades, unaware that a far more legible way to draw the same four numbers had been invented centuries earlier in Japan.

The bar gives us the four numbers we need, but it draws them weakly - you have to squint at ticks to see who won. Next, we keep the same OHLC data and repackage it into a shape the eye reads instantly: the candlestick.