Can you define Block Formatting Context and describe how it works?

You should immediately recognize this as a technical question. You are first asked to define a concept used in the front-end developer profession and then describe how it works. This is the classic form of a technical question. Make sure your answer is brief and to the point, and anticipate a follow-up question. This will indicate that the interviewer has a particular interest in this topic and may want to explore it in more depth.