The Difference Between a Trend and a Movement
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A trend is usually a shared surface feature, a particular sound or production choice that many artists adopt briefly because it currently works commercially, while a movement carries a genuinely deeper shared identity, philosophy or community behind the sound that outlasts any single passing commercial moment. Surface features can spread quickly precisely because they require little genuine commitment from the artists adopting them.
Chart data alone often cannot distinguish clearly between the two while they are actually happening, since both can produce a similar looking cluster of related entries arriving within the same general stretch of time on the very same chart. Only time reveals which cluster of releases was ever going to last beyond its first passing moment.
The real distinction usually only becomes clear with genuine hindsight, once a trend has faded back into obscurity while a true movement has continued producing meaningful new work and building a lasting, durable identity well beyond its own original commercial moment. That patience is exactly why serious observers wait before declaring anything a genuine, lasting movement.