of the presentation. Essentially, presentations can have one or more of the following 
functions:
UÊTo persuade . For example, a presentation may be designed to sell a particu -
lar product or to convince a group of coworkers to change a procedure in 
the workplace.
UÊTo explain . Examples include a half-day orientation meeting to explain 
company procedures to new employees, a lecture designed to teach a complex 
topic to college students, or a seminar to provide  in-depth  information to 
colleagues about a particular subject.