Integrated graphics are integrated in the CPU. Depending on what iGPU we're talking about, performance varies from 'just capable of media playback' to 'can run many games well at 768p/720p'. Most modern Intel chips have HD 520 or 530, of which HD 530 falls well into the 'can run games' category. However they'll never even go near discrete GPU performance. There's also the AMD APUs, which have beefier integrated graphics but are still sorely lacking for modern gaming.