It's called business collaboration with a high element of trust which is cultivated from honesty and transparency in values.

“I was looking to learn about digital marketing strategy and copywriting, and she had that experience in spades. She sought to learn about growing and scaling her startup, which I’ve done a couples times over. Thus, what began as a long-distance friendship, populated by random and infrequent phone calls or emails, turned into a mutual decision to pour into each other.”