Used in casual conversation, usually among students or in less formal academic settings. My prof's lectures are really engaging!
Pro Tip 2/3
Not for Address
While 'prof' is informal, it's not commonly used to directly address your professor as it may seem disrespectful. I'll discuss it later with my prof, not 'Hey prof, can we talk?'
Pro Tip 3/3
Abbreviation Context
'Prof' is an abbreviation; use the full title 'professor' in formal writing or when first introduced to someone. Professor Smith is my advisor, but I usually just say 'my prof.'