1. A casual, non-official request made in a relaxed or conversational manner, without formal procedures or documentation
He made an informal request to leave work early.
Ele fez um pedido informal para sair do trabalho mais cedo.
2. A request expressed in everyday language rather than official or ceremonial language
She submitted an informal request for a meeting with the director.
Ela apresentou um pedido informal para uma reunião com o diretor.