Both terms are equivalent. Initially, discipline defense with bare hands was called Karate (mains vides). It was adopted in the early twentieth century in schools as a martial art with great values in physical and mental domains. To consider karate as physical education as important as Kendo (the way of the sword) and Judo (the gentle way), Do (channel) was added to the word Karate in years 1920. We can say that in Japan, Karate word is used in oral conversations, and Karatedo is used in the literature. otherwise, the first is often used in a narrower sense (as in Karate Okinawan, french Karate, Shotokan Karate, etc.) Karatedo and represents the entire discipline like the Judo, du Kendo, Aikido, etc.