1# Persisters 2Persisters are responsible for persisting a [Persistable](../persistable.md) object to storage and are also used by the [Persistent Model](../persistent-model.md) meta-estimator to save and restore models. 3 4### Save 5To store a persistable object: 6```php 7public save(Persistable $persistable) : void 8``` 9 10```php 11$persister->save($estimator); 12``` 13 14### Load 15Load the saved object from persistence: 16```php 17public load() : Persistable 18``` 19 20```php 21$estimator = $persister->load(); 22```