Hooks (also known as lifecycle events), are functions which are called before and after calls in sequelize are executed. For example, if you want to always set a value on a model before saving it, you can add a `beforeUpdate` hook.
**Note:** _You can't use hooks with instances. Hooks are used with models._
For a full list of hooks, see [Hooks file](https://github.com/sequelize/sequelize/blob/master/lib/hooks.js#L7).
