Trend-following is the idea that some price movements persist for a while. If a market has been rising consistently, a trend metric may classify it as positive. If it has been falling consistently, the metric may classify it as negative. If movement is choppy and directionless, it may be called ranging.
The most common teaching tools are moving averages, slope, momentum, and breakout measures. These tools simplify messy data into a directional summary. That summary can be useful for learning, but it is not a prediction engine.
Trend strength
Trend strength asks whether movement is persistent enough to stand out from noise. A strong trend usually has price moving in one direction with fewer reversals. A weak trend may look directionless even if the final price changed.
Why trends break
Trends can reverse because information changes, liquidity changes, policy changes, or investor behavior changes. This is why REGIME FORGE avoids language like "the trend says buy." A trend label describes a historical pattern. It does not guarantee continuation.
Educational use
Students can use trend-following concepts to learn how rules convert raw data into classifications. The important questions are: which window did we use, how noisy is the data, how often does the label change, and what would make the classification unreliable?
In the Market Regime Visualizer, trend is presented beside volatility and drawdown so students can see that direction, instability, and loss are different concepts.