A sutta is a discourse in the Pali canon, usually beginning “Thus have I heard”. The Sutta Piṭaka gathers thousands of them in five collections, the long, middle-length, connected, numerical and minor discourses. The Mahāyāna produced its own sūtras, presented as the Buddha’s words.
Sutta
A discourse of the Buddha or his disciples; in Sanskrit, sūtra.
Also: Sutra (Buddhist)