What is a candlestick chart?
A candlestick chart is a type of financial chart that displays price movement over a specified time period. Each "candlestick" represents price action during one time period -- whether that is 1 minute, 1 hour, 1 day, or 1 week.
Candlestick charts originated in Japan in the 18th century, developed by rice trader Munehisa Homma. They became the dominant chart type in Western financial markets in the late 20th century and are now the universal standard for technical analysis in crypto and traditional markets.
Anatomy of a candlestick
Each candlestick has four components:
Open: The price at which the asset traded at the beginning of the time period.
Close: The price at which the asset traded at the end of the time period.
High: The highest price reached during the time period.
Low: The lowest price reached during the time period.
The rectangular body of the candlestick represents the range between the open and close prices. The thin lines above and below the body -- called wicks or shadows -- represent the high and low prices.
Bullish candle (green/white): Close is higher than open. Buyers were in control during this period. The body fills from the open (bottom) to the close (top).
Bearish candle (red/black): Close is lower than open. Sellers were in control during this period. The body fills from the close (bottom) to the open (top).
Reading candlestick size and shape
The size and shape of a candlestick tells you about the conviction behind the price movement.
Large body, small wicks
Strong conviction in one direction. Buyers (green) or sellers (red) dominated the entire period with little resistance. This type of candle in a trend confirms momentum.
Small body, large wicks
Indecision and volatility. Price moved significantly in both directions but closed near where it opened. The market is uncertain -- neither buyers nor sellers could sustain control.
Long upper wick, small lower wick
Price tried to move higher but was rejected. Sellers pushed price back down from the highs. Potentially bearish signal depending on context.
Long lower wick, small upper wick
Price tried to move lower but buyers stepped in strongly. The long lower wick shows rejection of lower prices. Potentially bullish signal depending on context.
The most important single candlestick patterns
Doji
A doji has an extremely small body -- open and close are at approximately the same price. It signals indecision and a potential reversal, especially after a sustained trend.
A doji at the top of an uptrend suggests buyers are losing control. A doji at the bottom of a downtrend suggests sellers are losing momentum.
Hammer
A small body at the top with a long lower wick (at least twice the body length) and minimal upper wick. Appears at the bottom of downtrends. The long lower wick shows that sellers pushed price down significantly but buyers rejected the lower prices and pushed back up. Bullish reversal signal.
Shooting Star
The mirror image of the hammer -- small body at the bottom with a long upper wick. Appears at the top of uptrends. Shows that buyers pushed price up significantly but sellers rejected the higher prices. Bearish reversal signal.
Marubozu
A large body with no wicks -- the open is the low (bullish) or the high (bearish), and the close is the high (bullish) or the low (bearish). Maximum conviction in one direction. A bullish marubozu indicates strong buying pressure from open to close with no hesitation.
Important multi-candle patterns
Engulfing patterns
A bullish engulfing pattern occurs when a large green candle completely "engulfs" the previous red candle -- opening below the previous close and closing above the previous open. Strong bullish reversal signal after a downtrend.
A bearish engulfing pattern is the reverse -- a large red candle engulfs the previous green candle. Strong bearish reversal signal after an uptrend.
Morning Star
A three-candle bullish reversal pattern:
Large red candle (downtrend continues)
Small candle or doji (indecision)
Large green candle closing well into the first candle's body
The Morning Star marks the bottom of a downtrend and the beginning of recovery.
Evening Star
The mirror image of the Morning Star -- a three-candle bearish reversal at the top of an uptrend.
Three White Soldiers
Three consecutive large green candles with minimal wicks, each opening within the previous candle's body and closing near the high. Strong bullish continuation or reversal signal indicating sustained buying pressure.
Three Black Crows
Three consecutive large red candles. Strong bearish signal indicating sustained selling pressure.
Timeframes and context
The same candlestick pattern means different things on different timeframes.
A hammer on a 1-minute chart is noise. A hammer on a weekly chart is a significant signal that has historically marked major market bottoms.
Most serious traders use multiple timeframes to confirm signals:
Daily or weekly charts for overall trend direction
4-hour charts for entry zone identification
1-hour charts for precise entry timing
AIOKA's Tech Hawk agent analyzes candlestick patterns across multiple timeframes as part of its technical analysis domain. Multi-timeframe confluence -- when the same signal appears on multiple timeframes simultaneously -- is weighted more heavily in the council's deliberation.
Candlesticks in context
Candlestick patterns are most reliable when they:
Occur at significant support or resistance levels
Appear with above-average volume confirming the move
Align with the broader trend direction
Are confirmed by other technical indicators (RSI, MACD)
Show confluence across multiple timeframes
A hammer at a major support level on high volume, confirmed by RSI reaching oversold territory, is a significantly more reliable signal than the same hammer in the middle of a range on thin volume.
The bottom line
Candlestick reading is the foundation of technical analysis. It is not magic -- no chart pattern predicts the future with certainty. But understanding what candlesticks tell you about the balance between buyers and sellers, the strength of trends, and the probability of reversals is an essential skill for any trader.
The patterns in this guide are the most widely recognized and historically reliable. Learning to read them fluently -- and more importantly, learning to read them in context -- takes practice.
AIOKA's Tech Hawk agent reads candlestick patterns continuously as part of its 27-signal technical analysis framework. Current technical reading visible at aioka.io/live.