Umeboshi are pickled (brined) ume fruits common in Japan. The word umeboshi is often translated into English as 'salted Japanese plums', 'Japanese plums' or 'preserved plums'. Ume is a species of fruit-bearing tree in the genus Prunus, which is often called a "plum", but is actually more closely related to the apricot. Pickled ume which are not dried are called umezuke (梅漬け).

Prunus mume is a Chinese tree species classified in the Armeniaca section of the genus Prunus subgenus Prunus. Its common names include Chinese plum, Japanese plum, and Japanese apricot. The flower, long a beloved subject in the traditional painting and poetry of Sinospheric countries, is usually called plum blossom. This distinct tree species is related to both the plum and apricot trees. Although generally referred to as a plum in English, it is more closely related to the apricot. In East Asian cuisine, the fruit of the tree is used in juices, as a flavouring for alcohol, as a pickle, and in sauces. It is also used in traditional medicine.