If you’re one student in a class of hundreds or only have a professor once during all of your college years, the chances are your only interactions with your teachers will be brief and impersonal. But if instead you’re in a small class or have the same professor for multiple classes, like ones in your major, you might have the opportunity to get to know them on a deeper level.
This could be through classroom interactions, office hour meetings or maybe even just while running into each other on campus.