Tattva (Sanskrit: तत्व) refers to the fundamental principles or elements that govern the universe in Hindu philosophy.

The concept of Tattva was first introduced in the Upanishads, a collection of ancient Indian texts that form the basis of Hindu philosophy.

• Tattva consists of five primary elements: Prithvi (Earth), Jala (Water), Agni (Fire), Vayu (Air), and Akasha (Space).
• The five Tattva are also sometimes referred to as the Pancha Tattva, meaning "five elements."
• The concept of Tattva is closely tied to the concept of Gunas, or qualities, which are believed to be the fundamental attributes of the universe.
• The five Tattva are also believed to be the source of all creation and are considered to be the fundamental building blocks of the universe.
• Tattva is also associated with the concept of Prakriti, or nature, which is the fundamental substance of the universe.
• The concept of Tattva has been influential in the development of Hindu philosophy and has been referenced in various Hindu texts, including the Upanishads and the Bhagavad Gita.