Astruggle between the primary character and another character is called

I am pretty sure the answer is FOIL. i learned this last year in English I

A struggle between the primary character and another character is called ‘internal conflict’ refers to a character’s internal struggle. A character might struggle with an emotional problem such as fear of intimacy or abandonment, for example. Internal conflict is important for characterization, since flaws and internal struggles make characters more lifelike and sympathetic.