The GameCube was a hit, not as big as the PS2 but it sold better than the Xbox. The GameCube was a big leap from the N64 and had 2 analog sticks this time around. 

The 2600 sold well for being one of the first console ever and having simple graphics. None the less the system had some fun games like PitFall and Pac-Man and helped give rise to the gaming industry we know and love.

This is subject to change, but in the few short years that the PS5 has been around, it has sold a surprisingly large amount. It is backwards compatible with PS4 games. It was hard to get your hands on one since it was scalped at launch and took almost 2 years before they were affordable.

The N64 was an insane improvement over the SNES. With 64 bit graphics, the N64 was capable of next level games like Super Mario 64 and Ocarina of Time. It had a strange 3 gripped controller.

The Genesis was a success that showed Sega could make games. A lot of the games were ports of existing Master System games but the Genesis helped Sega compete against Nintendo.

The SNES was a good improvement over the NES and had some incredible games. Not enough to outsell its predecessor but how can you top such a great debut.

The Xbox One was not successful at first. It was over priced, couldn't run games as well as the PS4, and was marketed poorly. After the release of the rivised One S and the One X, the system turned around and started to sell much better.

The Nintendo Entertainment System was a runnaway success for the Japanese game company. It was the first console to run games this well in the US. It was marketed as an entertainment system and not a game console due to the game market crash in the 1980s.

The 3DS did a lot of things right, but it wasn't marketed at the casual audience and thus couldn't sell as well as it's predecessor. With a massive library of good games to play, it was worth high price tag.

The GameBoy Advance sold really well for nintendo. It wasn't as successful as the GB or GBC but it still had the power of an SNES on the go. It was no PSP though.

The PSP was an incredible handheld for the time complete with a browser and PS2 quality games son the go. The GBA had nothing on it and the PSP ran away with it.;

This system was on top of the world this generation. Games like Halo 3, CoD, Minecraft and so many more. It helped it was cheaper, and easier to develop for than the PS3.

The PS3 took the win over the Xbox 360 right at the end of its life. Last minute launches like "The Last of Us" helped to contribute to sales after the PS4 had come out. It was behind and sony actually didn't make profit off of the ps3 until years after launch. It had 3 models, the base, Slim, and Super Slim.

Nintendo made the right move by focusing on the more casual and non-gamers. Everybody and their Moms had a Wii. It came with Wii Sports which meant people could just play it and it's motion controls were easy to understand. It won the generation by far, despite a lot of gamers not considering it to be on the same level as PlayStation or Xbox.

Sony's debut to console wars was a massive success, outselling Sega and Nintendo and coming out on top of that generation.

The PS4 completely destroyed the Xbox One. Microsoft made a lot of mistakes that directly lead to PS4 sales. The system also had incredible games that just gave them the edge over Microsoft.

The GameBoy and GameBoy Color were combined for sales. The GameBoy was the first true handheld game system. People loved it for it's massive library of fun games that can be played on the go. It had incredible battery life too.

This Switch is tricky because it is systems still get sold today meaning this number is subject to change. The Hybrid design helped sell the system with the promise of portable Home console experience.

The DS was an interesting system. It was marketed towards both casual and serious gamers. It had 3 different models so technically it wasn't 1 system but it is really hard to separate them. 

The PlayStation 2 is and has been the number 1 selling system of all time for years. It helps that A) it was also marketed as a dvd player and was cheaper than the competition, and B) it was supported until 2014, over a decade after it launched. It's safe to say, the Xbox and GameCube had nothing on the PS2. The backwards compatibility with PS1 games and releasing a year prior to the other systems, Sony had a major advantage.