use Magento\Customer\Api\Data\CustomerInterfaceFactory; use Magento\Framework\ObjectManagerInterface; class MyClass { protected $customerFactory; protected $objectManager; public function __construct( CustomerInterfaceFactory $customerFactory, ObjectManagerInterface $objectManager ) { $this->customerFactory = $customerFactory; $this->objectManager = $objectManager; } public function createCustomer() { // Create a new customer using the factory $customer = $this->customerFactory->create(); // Set the customer's name and email $customer->setFirstName('John'); $customer->setLastName('Doe'); $customer->setEmail('johndoe@example.com'); // Save the customer using the ObjectManagerInterface $this->objectManager->create('\Magento\Customer\Api\CustomerRepositoryInterface') ->save($customer); } }In this example, we're creating a custom class called "MyClass". We're injecting two dependencies: the CustomerInterfaceFactory and the ObjectManagerInterface. We then define a method called "createCustomer" which uses the factory to create a new customer object. We set the customer's name and email, and then use the ObjectManagerInterface to save the customer to the database. The package/library associated with the ObjectManagerInterface is the magento/framework package. This package contains all of the core Magento classes, including the ObjectManagerInterface and many others.