Lists the currently loaded kernel modules, which are bits of code (for drivers usually) dynamically loaded into the Linux kernel at runtime.
E.g. lsmod | grep "nvidia" should show you the Nvidia drivers installed on your Linux system.
nvidia_drm 118784 8
nvidia_uvm 3506176 0
nvidia_modeset 1585152 11 nvidia_drm
video 77824 2 asus_wmi,nvidia_modeset
nvidia 62390272 197 nvidia_uvm,nvidia_modeset
Use modinfo to show greater detail about a kernel module.