• Any code that creates and manipulates data

• in Rails this code can be placed in models or controllerss

  • view displays data
  • controller receives requests and passes data between models and views.
  • model should be where most business logic should be
    • validate
    • calculate

• can also be placed in helpers and service objects

# References

https://www.reddit.com/r/rails/comments/77eesr/what_is_business_logic/