What is "yesod"

Yesod ( Hebrew: יסוד "foundation") is a sephirah in the kabbalistic Tree of Life. Yesod is the sephirah below Hod and Netzach, and above Malkuth (the kingdom). It can be seen as the vehicle, from one thing or condition to another (the power of connection).

Yesod (; , "Foundation") is a free and open-source web framework based on Haskell for productive development of type-safe, REST model based (where URLs identify resources, and HTTP methods identify transitions), high performance web applications, developed by Michael Snoyman et al.

Yesod is based on templates, to generate instances for classes, entities, and dynamic content process functions, making use of Haskell compiled templates called QuasiQuotes, that admits code expression interpolations in web-like language snippets, making it fully type-checked at compile-time.