Internet exchanges offer a layer-2 platform and switch technology in different cities and locations around the globe. Network providers can use this platform to connect to other networks via public peering, and can extend their networks to third-party networks and services. In this way, internet exchanges help to connect and built the internet and reduce the costs for network providers. 

Currently, there are more than 500 internet exchanges available around the globe. The six largest internet exchanges related to data traffic are DE-CIX (Frankfurt), AMS-IX (Amsterdam), IX-BR (Brazil), LINX (London), MSK-IX (Moscow), and DATAIX (Saint Petersburg). To see a good map of all global internet exchanges, you can visit website: https://www.internetexchangemap.com/.