The Genesis had a palette of 512 colors, of which it could display 64 colors at any one time. As time went on, however, the programmers figured out tricks that made it appear like it could display more colors: they could make make onscreen colors appear darker or lighter (shadow and highlight mode) and could substitute one color for another (palette swaps). This can be seen in games like Ecco the Dolphin.
Its main processor was a Motorola 68000, which was also used on the Macintosh Plus
and Macintosh Classic from Apple. It had a resolution of 320 x 224 pixels.
As time went on, Sega released new versions of its 16-bit hardware. One of the most
convenient ones was the Genesis CDX, which combined a Genesis and a Sega CD on a single, portable
unit. As a bonus, you could also listen to audio CDs on the road.
Sega later released the Genesis Nomad, a portable Genesis with its own
screen. Most Genesis games run in it without problems. Unfortunately, you cannot
connect a Sega CD player to it.
The Genesis ended up having more that 500 games.
These are some of my favorite games for the Sega Genesis, listed by category: