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```