What are the differences between Altus and Alivio components for bicycles?

Altus and Alivio are both component groups made by Shimano for bicycles, but there are some key differences between them. Altus is considered an entry-level group, offering basic functionality and durability at a lower price point. Alivio, on the other hand, is a step up in terms of performance and features, with smoother shifting and better overall quality. In general, Alivio components are lighter, more precise, and offer a wider range of gears compared to Altus.