Uji tea; high-grade green tea from Uji, Kyoto
Refers specifically to tea grown in the Uji region, known for its quality and often used in tea ceremony.
When I go to Kyoto, I want to buy authentic Uji tea.
Uji tea is said to have a particularly good aroma among Japanese teas.
Sencha is a common type of green tea; Uji tea is a regional brand that can include sencha but is specifically from Uji.
From 宇治 (Uji, a region in Kyoto) + 茶 (tea). The name simply denotes tea produced in Uji.