A more thorough explanation:

Definition: A gratuitous assignee is someone who receives an assignment (transfer of rights) without paying for it or providing anything in exchange.

Example: John decides to give his car to his friend, Sarah, as a gift. He writes a document assigning the ownership of the car to Sarah, but Sarah does not pay anything for it. In this case, Sarah is a gratuitous assignee.

This example illustrates the definition because Sarah received the assignment without giving anything in exchange. John gave the car as a gift, and Sarah did not have to pay for it or provide anything else in return.