The Katha Upanishad (Sanskrit: कठोपनिषद् or कठ उपनिषद्) (Kaṭhopaniṣad) is one of the mukhya (primary) Upanishads, embedded in the last eight short sections of the Kaṭha school of the Krishna Yajurveda. It is also known as Kāṭhaka Upanishad, and is listed as number 3 in the Muktika canon of 108 Upanishads.
The Katha Upanishad consists of two chapters (Adhyāyas), each divided into three sections (Vallis). The first Adhyaya is considered to be of older origin than the second. The Upanishad is the legendary story of a little boy, Nachiketa – the son of Sage Vajashravas, who meets Yama (the Hindu deity of death). Their conversation evolves to a discussion of the nature of man, knowledge, Atman (Self) and moksha (liberation)