Taiwan cherry (Prunus campanulata) is native to Japan, Taiwan, southern and eastern China, and Vietnam, blooming from January (in Okinawa; the southernmost and westernmost prefecture) to March (the mainland) in Japan. The blossoms are pink but much deeper than other cherry blossoms and are bell shaped, which is also different from others.
Cherry blossoms usually mean Somei Yoshino cherry blossoms (Prunus x yedoensis) in mainland Japan but Taiwan cherry in Okinawa. Somei Yoshino and Taiwan cherry blossoms are quite different but both are beautiful respectively.