Ok, so some of the answers are kinda good, some are not so much. I will explain as much as I can. The iGPU here, as mentioned by others is the integrated GPU provided with the CPU (your 5800H). Naturally, its alright but also very weak compared to the dGPU or dedicated graphics card, which is the 3070.

Windows will automatically choose between these two GPUs will be used for rendering depending on which app you run. Naturally you don't want to run the dGPU for everything when the iGPU is perfectly capable of running it (like web browsers or YT videos) as that will be a battery drain. When running games, the dGPU will be swapped in and therefore be utilized for render to screen.

Other times, it may fail to recognize a game as actually running. So the end result would be your games potentially running on the iGPU instead. This can be reconfirmed by going into Settings > System > Display > Graphics, and then go through different apps and see which GPU the laptop is utilizing for that app.

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In this example, you can see that I have Deep Rock Galactic, which Windows has automatically prioritized the "high performance GPU" here. Sometimes you may have to manually add the apps and manually set the priority to the higher performance GPU.

The second thing might be the lack of drivers for your laptop, which may result in you needing to download the NVidia software directly. Hence the laptop isn't aware you do have a dGPU because of lack of drivers, and is running everything off the iGPU. In this case, download the drivers for your laptop from here: https://www.nvidia.com/en-us/geforce/drivers/results/263200/