What’s the difference between a roller brush and side brush?

The roller brush is the large central brush that spins like a rolling pin to agitate and suction dirt from the floor, while the side brush is a smaller rotating brush on the edge that sweeps debris from corners and baseboards toward the roller brush. Think of it like a cleaning team: the roller brush is the main cleaner, and the side brush is the detail specialist.Do I need both brushes on a robot vacuum

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