Presentation technology is an umbrella term used to describe things such as projectors and speakers.
These pieces of technology are used in the work place to present things, such as new ideas and innovations for a company.
A speaker and microphone may be used as a pair in order to make someone's voice more clearly heard amongst a large crowd.
A projector can be used to project an image, video, or text onto a large screen for many to see easily.
I hope this helped.