 Even after 18 years, Call of Duty is still one of the most popular games. Released in 2003, it was your typical FPS game. Its story mode was good and featured many things players and critics liked. They had good AI and the World War 2 scenes were more realistic from the average game. It had good graphics and effects at the time. It even had motion blur in some scenes which is really advanced at the time. This started Call of Duty's popularity. Its player base started expanding game after game because it was simply the best quality first-person shooter at the time. When COD Modern Warfare came out, it revolutionized FPS even more. Modern Warfare was so unique because it was finally a game that was in the future and not stuck in the 1900s. They also included classes so you get different weapons when you choose a different class. This will influence a lot of games later on. This showed that Activision can put out quality content and really fun games even in a whole new setting. This also made FPS games a sporing. But 2010 is the year when COD exploded. Its release of Black Ops changed the FPS scene entirely. Black Ops 1 had very good zombies, campaign and multiplayer modes. The multiplayer mode was Modern Warfare 2 but with balancing changes like no more nukes and quickscoping. The zombies are also tons of fun, probably one of the best COD modes ever made. The storyline is also well made in Black Ops 1. It makes Sumona know more and search for answers. It was also the year Faze Clan was founded and they made COD go viral on YouTube. The audio, graphics, effects and just everything about COD 2010 was top notch when it came to production. This was also the year of its most selling game which was 31 million copies. The years after this, 2011 and 2012 also had the second and third most sales respectively. So the numbers basically show that this was the game that catapulted the growth of the next decade for it. But don't they release a game every year? Well, every game comes with new content and the devs are always focused on that mainly. They went from jet packs to outer space. Even as 2019 release of Modern Warfare is extremely refreshing. Companies like 2K Entertainment make the same game every year and improve the graphics and update the meta. COD expands their FPS content every year. Finally, it's because when some people play, they want to play with their friends. A lot of players feel nostalgia when they think about playing the original Modern Warfare after school. Crazy thing is that COD in 2021 could still be considered nostalgia in like 2030. I personally think that this is the most successful franchise in all of gaming. And even if it one day dies out, which is definitely going to happen inevitably, it will still be one of the biggest franchises that influenced other games and changed gaming forever. Especially FPS gaming.