What it is
Ichimoku Kinko Hyo, developed by the Japanese journalist Goichi Hosoda and published in 1969 after decades of work, is not an indicator but a complete charting system. Five lines together are meant to show trend, momentum, support and resistance at a glance; the name translates roughly as one-glance equilibrium chart.
How it works
Tenkan-sen is the midpoint of the highest high and lowest low over 9 periods. Kijun-sen is the same midpoint over 26. Senkou Span A is the average of those two lines plotted 26 periods into the future, and Senkou Span B is the 52-period midpoint, also plotted 26 forward. The shaded area between the two spans is the kumo, or cloud. Chikou Span is simply the current close plotted 26 periods back. Note that the system uses range midpoints rather than averages of closes, which makes it respond differently from a conventional moving-average setup.
How traders use it
The standard reading stacks conditions rather than relying on any one of them. Price above the cloud is a bullish regime and below it bearish. A thick cloud implies a well-defended zone while a thin one is easily cut through. A Tenkan cross above Kijun is a momentum trigger whose quality depends on where it happens relative to the cloud. Chikou clearing the price action of 26 bars ago is treated as confirmation. Because the cloud is drawn forward, a trader can see where support or resistance will sit over the coming weeks.
Where it breaks down
The parameters carry historical baggage: 9, 26 and 52 come from a Japanese trading calendar with a six-day week, so they no longer correspond to a week, a month and two months of sessions. The system lags heavily by design, since Kijun and Senkou B respond slowly, and in fast or gapping markets confirmation arrives late. Above all, the projected cloud is a mechanical shift of data that already exists, not a forecast; reading it as a prediction of future price misunderstands how it is drawn.
Educational reference. This entry describes how a concept is defined and used. It is not investment advice, not a recommendation, and not a signal. Any rule you build from it should be tested with realistic costs before it is traded, and no historical result guarantees a future one.