The bar chart (OHLC)

The line chart is peaceful, but it has a fatal flaw: it assumes the journey from yesterday's close to today's close was a straight line.

If a stock closed at ₹100 yesterday and ₹105 today, the line chart tells you it was a good day. But what if it actually opened at ₹100, crashed to ₹50 on terrible news, and then violently recovered to ₹105 because of a massive buyout offer? The line chart hides the crash and the recovery entirely.

How do we capture the violence of the trading day without overwhelming the chart?

The bar chart exists to solve the line chart's amnesia. It records the entire boundary of the day's battle.

It does this by plotting four specific numbers for every single time period:

1. Open (O): The first trade of the day.
2. High (H): The absolute highest price someone was willing to pay.
3. Low (L): The absolute lowest price someone was willing to sell for.
4. Close (C): The final agreed price when the bell rang.

Together, these form the OHLC bar.

Instead of a dot, a single day is represented by a vertical line with two horizontal ticks on it.

Interact with the playbook below to see how the four data points (Open, High, Low, Close) assemble into a single positive bar.

• The vertical line shows the total range of the day (High to Low).
• The left tick is always the Open.
• The right tick is always the Close.

If the right tick (Close) is higher than the left tick (Open), the buyers won the day. If the right tick is lower, the sellers won. Here is how a negative, seller-dominated day forms:

Every price in this module is an illustrative example, not a real quote. [illustrative]

The shape of an OHLC bar tells you exactly what kind of market you are in.

1. The small, tight bar: A mature FMCG company on a quiet Tuesday. The Open and Close are close together, and the High and Low aren't far away. Nobody is panicking.
2. The massive vertical bar: A small-cap stock that just announced earnings. The distance between the High and Low is enormous, showing a brutal fight over valuation.
3. The bar with no left/right ticks: A stock locked in a circuit. It opened, hit the upper circuit limit instantly, and stayed there all day. The Open, High, Low, and Close are all the exact same number.

An OHLC bar tells you the extremes of the day, but it does not tell you when they happened.

Did the stock hit its Low at 9:15 AM and spend the rest of the day slowly climbing to the High? Or did it hit the High at 9:15 AM, crash to the Low, and then spike back up right before the close? The bar looks identical in both cases.

Because a bar chart uses thin lines and small ticks, it is visually exhausting to read when you zoom out to look at 200 days of data. The left and right ticks start blurring together, and it becomes very hard to tell at a glance if buyers or sellers were in control of a specific week.

There is a subtler trap. Because the right tick sits at the top of the bar when a stock closes strong, people read a "close near the high" as proof the stock is going up. But a bar is a record of one finished day, not a promise about the next one.

Before you trust a strong close, ask: what would change your mind? If the very next bar opens lower and closes below this bar's low, the "buyers in control" read is gone, and the strong finish was just one day's noise.

Western traders used bar charts for decades, suffering through this visual clutter, completely unaware that a much more elegant solution had already been invented centuries earlier in Japan.

The bar chart gives us the four data points we need (OHLC). But the way it draws them is visually weak. We need a way to instantly see who won the day without squinting at tiny horizontal ticks.

That brings us to the Candlestick.