All written documents should be directed to a particular readership. This requirement is even more important in oral presentations; an audience is assembled to hear a talk that was advertised to address a specific subject. They usually assemble in a defined space, usually a room. They are captive. You must accommodate them by delivering facts and information on the advertised subject. Formal talks will have a specific title like: Abrasion Resistance Testing with Abrasive Finishing Tape