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A trendline is a straight diagonal line drawn along a series of price points to show the direction and strength of a trend. In an uptrend it connects rising swing lows and acts as dynamic support; in a downtrend it connects falling swing highs and acts as dynamic resistance. Trendlines help traders visualise momentum, spot potential entry areas, and recognise when a trend may be weakening or breaking.

To draw an uptrend line, connect at least two, ideally three, higher swing lows with a straight line and extend it forward. For a downtrend, connect lower swing highs. Aim to touch the extremes of the moves without cutting through price, and use higher timeframes for more reliable lines. The more times price respects a trendline, the more significant it becomes as a reference level.

You need a minimum of two points to draw a trendline, but at least three touches make it far more reliable, because the third confirms that price is genuinely respecting the line. Two points establish the potential line; the third validates it. A trendline that has been tested several times without breaking is generally viewed as stronger and more meaningful than one based on only two points.

A trendline break occurs when price closes clearly on the other side of the line rather than briefly poking through it. Traders often wait for a decisive close beyond the trendline, and sometimes a retest of the broken line from the other side, to confirm the break is genuine. False breaks are common, so confirmation and a stop-loss help manage the risk of acting too early.

A single trendline tracks one side of a trend, usually acting as support in an uptrend or resistance in a downtrend. A channel adds a second, parallel line on the opposite side, framing price between two boundaries. Channels help traders see the full range of a trend, identify potential reversal zones at each edge, and gauge where price might be relatively high or low within the move.

Traders often look to buy near a rising trendline in an uptrend or sell near a falling trendline in a downtrend, placing a stop-loss just beyond the line in case it breaks. Others trade trendline breakouts once price closes firmly through the line. Combining trendlines with support, resistance, or candlestick confirmation improves reliability. Since CFDs are leveraged, always set your risk in advance rather than trusting the line alone.