A trend is genuinely growing when attention increases across repeated observations, related activity broadens, and the rise is not explained entirely by one short-lived event or one personalised feed.
Most online trends move through discovery, acceleration, broad adoption, saturation and decline, although they can pause, recur or split into smaller subtrends.
Analyse a trend by defining the question, choosing a relevant baseline, measuring direction and speed, checking geography and related topics, then writing down what the evidence does not prove.
A fad is a short burst of attention with little durable behaviour behind it. A trend shows a broader, sustained change in what people search for, discuss, watch or do.
Find trending topics by starting with a broad discovery source, narrowing by country and category, checking whether attention is accelerating, and confirming the signal in at least one independent place.
Trend momentum describes how attention is moving over time. It is useful for investigation because direction and pace often matter more than one isolated spike.
A trending topic is a subject attracting unusually strong or changing attention in a particular place and time. The useful question is what is driving that attention.