You still have a GPU (graphics processing unit, can't see any video without one), you just can't use it for rendering, probably due to low video memory. But it is there.
I used to use a 4Gig 1050TI video card for renders, it would revert to CPU if I wasn't careful. I had to shut down all programs that use video memory (like my browser etc), then when I created a scene, I would hide all objects that were not seen by the camera (click each object and click the eye icon in the scene panel, upper right), and then I sometimes used software to reduce the texture sizes down to preserve GPU memory. I would even hide parts of character's bodies that were not visible, like legs and hips, or an arm that wasn't visible etc... every little bit counts. Reduce enough and you may be surprised that it will use the GPU. It just needs to fit into your limited video RAM... you also need an NVidia card or it will use CPU. Also use denoising which can help you get a render out faster with a decent enough quality.
Even if you only use CPU for rendering, you can still speed up render times by doing the above tricks.
This year I finally bought a "cheap" RTX3060 video card with 12G of VRAM on it and that made all the difference. Video RAM makes a bigger difference than anything else for 3D rendering.
