Why (and how to) switch to OpenStreetMap ?

Almost everyone use nowadays maps on a daily basis ; it could be with an app on your phone or online. Most of the people use Google Maps (or other solutions from big companies) but I’ll (try to) convince you that it’s easy to use OpenStreetMap but also why OpenStreetMap is a better option when it comes to maps, not only for your website but also for your daily life (app of your phone, navigation, …).