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With integrated graphics now built in to the motherboard on the vast majority of computers, there is no need for a separate graphics card for most uses. Aside from gaming, if you do graphics heavy work, a dedicated graphics card can be needed, but for watching cat videos, word processing and number crunching (which I believe to be the three main uses of modern technology) integrated graphics are sufficient.
I ran across this neat review where they took motherboards and chipsets from 2006 to current for an "Integrated Graphics Showdown." It must have really been a pain in the neck to do, but it's interesting. Integrated graphics have come a long way in the past few years.