GPU and graphics cards are the same things–the GPU is just a specialty kind of graphics card used for more demanding processes such as virtual reality or 3D rendering.
Graphic Cards are often abbreviated “GPU” by gamers. A graphics card is a piece of hardware that takes information from your computer’s CPU and makes it show up beautifully on the screen, even when there are many different things happening all at once. The most common use for this would be modern games. Additionally, the graphics cards are necessary to translate video signals for TVs set to “PC” mode.