People always say “do research on the firm b4 you go to a job interview”. Precisely, what should we look for?

Yay Ah!: People always say “do research on the firm b4 you go to a job interview”. Precisely, what should we look for?
Please don’t give answers that most people already know.

Answers and Views:

Answer by Mitch
It is imperative to get complete information about your interviewer. It is essential because you can expect questions about the nature of activities of the interviewer. If it is some organization, you need to know its business interests, its performance, its position in the relevant field, the management structure, their hiring policy, their corporate behavior, etc.