Can someone explain why my Dell has two graphics units?

By ontodva ·
Tags: Hardware
I bought a Dell Inspiron 15 7000. It has two graphics units: Intel uhd graphics 620, integrated, with no RAM of its own apart from L3 cache, and NVIDIA GeForce MX130 with 4GB RAM.
I would like to understand the purpose of the dual graphics capability, and whether I should take steps to ensure the Nvidia is always used.

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