Japanese language proficiency is not always required, but it is highly preferred for many jobs in Japan. Companies in IT, engineering, and international firms often hire English-speaking professionals, especially in cities like Tokyo, Osaka, and Yokohama. However, having basic Japanese skills can improve communication, increase job opportunities, and help with daily life. For roles in healthcare, teaching, and customer service, knowing Japanese is usually essential. Learning the language also helps in career growth and makes it easier to integrate into Japanese work culture.