noun
A person whose role is to guide, show around, or host someone, such as at an event, tour, or facility.
彼が工場見学の案内役を務めた。
He acted as the guide for the factory tour.
パーティーの案内役として
As the host of the party, I introduced the new employees.
ガイド is a common loanword for a professional guide, especially in tourism, whereas 案内役 can be used for any appointed guiding role.
Compound of 案内 (guidance, information) and 役 (role, duty). The exact historical derivation is straightforward; the word has been used since at least the early modern period.