NVIDIA

The NVIDIA GPU is Article description::a popular graphical chipset manufacturer.

NVidia GPUs can use either open source or proprietary (close source) drivers. Because it is more up-to-date and efficient, the proprietary driver is often seen as a must-have for more computationally intensive 3D applications and games.[SOURCE ]

What is Nvidia Optimus?
TLDR: Notebooks with Nvidia GPU and Intel iGPU that is connected to the dislays and data from GPU is piped through iGPU to get better battery life.

Nvidia Optimus is a computer GPU switching technology created by Nvidia which, depending on the resource load generated by client software applications, will seamlessly switch between two graphics adapters within a computer system in order to provide either maximum performance or minimum power draw from the system's graphics rendering hardware. --

Closed-source drivers:

 * NVidia/nvidia-drivers - A guide on how to install the closed-source NVIDIA drivers as a primary display handler.
 * NVIDIA Optimus - How to implement the power of NVIDIA's Optimus in hybrid graphic setups.
 * NVIDIA Bumblebee - How to implement Hybrid Graphics with Bumblebee and Primus.

Open-source drivers:

 * nouveau - Freedesktop.org's open-source drivers for NVIDIA graphic cards.
 * nouveau & nvidia-drivers switching - An article with instructions on how to switch between closed and open source drivers.