@Vincenzo -- There are some integrated graphics setups that will work fine with a lot of games. They are almost never as powerful as separate graphics cards, but some people can play games just fine on them.
What you want to do if trying to decide whether to get a graphics card or go for a system with less expensive, integrated graphics (the least expensive option), do some some research. You will find plenty of sites that will tell you how well integrated graphics configurations will run modern games. Go with the one that will handle most of the games you want to play with ease.
Again, standalone cards are preferred by integrated graphics are getting a lot better. That is especially true when it comes to gaming laptops.