What is the function of a Video Card in a computer?

The function of a video card, also known as a graphics card or GPU (Graphics Processing Unit), is primarily to generate and render graphics. It is responsible for creating the images that are displayed on a computer screen by processing the graphical data sent from the CPU. This includes rendering 3D graphics for video games, editing images and videos, and powering high-resolution displays. The video card has its own memory (VRAM) and processing capabilities, which enable it to handle complex graphic calculations efficiently, often relieving the CPU from these tasks and enhancing overall system performance in graphic-intensive applications.

In addition, while some of the other options present related functionalities within a computer, they do not accurately describe the primary role of a video card. For example, processing audio signals is typically handled by sound cards or integrated audio components, capturing live video is a function of video capture cards or webcams, and expanding the motherboard's capability generally pertains to the addition of components like expansion cards rather than the specific function of a video card. Thus, the correct choice emphasizes the essential role of the video card in the visual performance of a computing system.