From the perspective of value zone theory, a trend is the process through which fundamental factors affecting the market undergo a qualitative change, causing the market price to deviate from its original value zone in search of a new value zone.
From the perspective of technical analysis, a trend is the process of market volume accumulating over a period of time, leading to a release of that volume at a certain point, or the transformation of potential energy into kinetic energy.
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Once a trend is established, prices will move along a visible channel. In an upward trend, each low point of a pullback is continuously raised; in a downward trend, each high point of a rebound is continuously pushed lower.