How a candle forms — body, wick, meaning

Why do chart readers prefer strange, blocky "candlesticks" over a simple, clean line chart?

If a stock opens at ₹100 and closes at ₹105, a line chart simply connects a dot at ₹105. But what if, during that exact same day, the stock crashed to ₹80 and rallied to ₹120 before settling at ₹105? A simple line completely erases the violence of that intraday battle. How do you capture the full story of fear and greed that occurred within a single session?

A candlestick is an elegant visual summary of a single trading session. Whether that session is five minutes or five months long, a candle records exactly four prices: the Open, the High, the Low, and the Close (OHLC).

The space between the Open and the Close forms the Real Body.

• If the Close is higher than the Open, the body is coloured green (or hollow). The buyers won the session.
• If the Close is lower than the Open, the body is coloured red (or filled). The sellers won the session.

The thin lines extending above and below the body are the Wicks (or shadows). They represent the extreme highs and lows that were explored during the session but ultimately rejected.

• A long upper wick shows that buyers managed to push the price very high, but sellers pushed it back down before the session ended. It is a visual record of a failed rally.
• A long lower wick shows that sellers drove the price down, but buyers stepped in and aggressively bought the dip, pushing it back up. It is a visual record of a failed sell-off.

The size of the real body tells you the conviction of the winner. A massive green body means the buyers dominated from the opening bell to the close. A tiny body means neither side could gain meaningful ground, resulting in a stalemate.

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

See how altering the balance of power between the open, close, and extremes physically morphs the shape of the battle.

A candle is an incredible summary, but it fundamentally hides the sequence of events. A massive upper wick tells you the price went up and came down, but it does not tell you if it went up in the first five minutes and bled out for the rest of the day, or if it chopped around for hours before a wild spike and crash at the close.

More importantly, a single candle only records a finished battle; it never guarantees the next one. A massive green candle shows you the buyers won today, which raises the probability that momentum continues tomorrow, but it cannot promise it. You must always define what would change your mind—if the very next day forms an equally massive red candle erasing all the progress, you must accept the buyers' control was an illusion.

Fin-influencers love to zoom in on a single, massive green candle and declare that a stock is "breaking out" or "going to the moon." They sell the illusion that one powerful session mathematically guarantees a massive trend.

This is manipulative because a candle is just a snapshot of a single fight, not the entire war. A massive green candle inside a long-term downtrend is often just a short-squeeze or a relief rally, not a trend change.

Understanding how a single candle forms is the absolute baseline of chart reading. It allows you to look at a block of colour and instantly read the fear, greed, and conviction of the crowd during that session.

Once you can read one battle, you can begin to classify the specific, recurring shapes these battles take, which is what we will explore in the next module.