Group meaning is simple as it is a number of or a collection of people who are together, gathered, or classes together.
A structured conversation having two sides engaged, one side asking questions (interviewer) and the other side providing the answers (interviewee), is termed an interview. It is a one-on-one conversation in common parlance.
It is of two types, namely a candidate and Panel. Candidate Interview refers to the type of interview where, at the same time, more than two participants are interviewed, whereas Panel Interview refers to the kind that involves a single candidate as the interviewee and more than two or even a group of participants as the interviewers belonging to different departments.