how many upanishads are there

There are traditionally 108 Upanishads recognized, as enumerated in the Muktikopanishad. These 108 Upanishads are divided according to the four Vedas, with specific numbers assigned to each Veda: 10 from Rigveda, 19 from Shukla- Yajurveda, 32 from Krishna-Yajurveda, 16 from Samaveda, and 31 from Atharvaveda. Among these, about 10 to 13 are considered the most important or principal Upanishads from the perspective of Vedantic philosophy. The exact number of Upanishads can vary according to different scholars, but the figure of 108 is most widely accepted and traditional.