All computers have a CPU, but most laptops and many cheaper desktops don't have a dedicated graphics processor or GPU. Instead, their display output comes from a portion of the CPU, a slice of silicon known as an integrated graphics processor (IGP). An IGP is fine for basic tasks, such as checking your email, browsing the web, or even streaming videos. Doing productivity work on an IGP is completely within bounds. Indeed, most business desktops rely on IGPs. In any case, an IGP is not the answer for anyone who wants to run intensive 3D games, render architectural simulations, or perhaps train an artificial intelligence algorithm. These situations—especially games, but often pro-grade apps, too—can benefit from more muscular graphics. Times like these call for a graphics card, which will bring its own GPU to the game, and the most powerful of these are found in the best PCs for gaming.  Choosing a graphics card is a complex affair. Gamers should consider the capabilities of their monitor first. A 4K monitor or one with a high refresh rate (144Hz or greater) will require a profoundly powerful GPU (or occasionally even two GPUs) to display games at the monitor's maximum potential. If you're just looking to do some middle-of-the-road gaming on a 1080p monitor (and not looking to win any professional esports crowns), a mainstream card will do just fine. Meanwhile, creative professionals and other power users should consider the graphics-acceleration recommendations of the apps they plan to run, using the software maker's system requirements as a guide. Graphics-accelerated video rendering or AI programs can benefit from the same types of GPUs as intensive 3D games. Professionals eyeing workstations will want to consider Nvidia's RTX A series lineup or AMD's Radeon Pro models. Check out our deep-dive guide to graphics cards for much more on the nuances of today's video cards.