Symfony | Doctrine vocabulary/ basic philosophy?

Question

Am I right if I say?
-An "entity" is an object instanciate from an Entity Class representing an entry.
-An "entitymanager" is an object that kind of manage which databases need to be use during a request.
-A "repository" is a kind of space where to manipulate requests.
For example if I want to get 1 entry from my database it will use the manager to connect each database needed, preprare requests with the repository and return one entity as object?
I try to get the basic concept before to go deeper. Thanks!

Answer 1

example

$article = $entityManager->find('CMS\Article', 1234); $article->setHeadline('Hello World dude!');

$article is the entity

repository: your database