Sh. Dr. Hatem al-Haj describes the reason behind using the term “apologetics”. Islamic apologetics is about defending the doctrines of the faith in rational terms. When people hear the term “Islamic apologetics” they can understand that this is an academic discipline that requires research.
This clip is from Sh. Dr. Hatem al-Haj’s seminar on Islamic apologetics. You can read the publication on this topic here.