How projects are judged depends upon the division you compete in. Elementary and Junior division projects are judged solely on the board and artifacts that you bring to the fair. This includes items such as the research plan and research notebooks.
The Senior division students will be judged in-person at the specified date and time. The interview may be done via teleconference if the fair is online-only. The board or presentation and artifacts are considered but the interview is the major factor. Judges will have expertise in the topic category you have chosen.