In essence, yes. Mandarin is a dialect of Chinese. Other Chinese dialects include Cantonese, Shanghainese, Wu, and others. Most of the Chinese speak Mandarin, but not all Chinese-speaking countries do. For example, Hong Kongers speak Mandarin, but Cantonese and English are the country’s languages of choice. Meanwhile, Macau and Taiwan use Traditional Chinese, while Mainland China and Singapore use Simplified Chinese.