1. casual relationships or connections with people outside of formal or official channels, typically used for networking, information exchange, or personal relationships
She built her career through informal contacts in the industry.
Ela construiu sua carreira através de contatos informais na indústria.
2. personal acquaintances or connections that are not bound by official protocols or formal agreements
The project moved forward thanks to informal contacts between the teams.
O projeto avançou graças aos contatos informais entre as equipes.