Answer:
they keep the presenter from reading the speech
Step-by-step explanation:
PowerPoint application can be defined as a software application or program designed and developed by Microsoft, to avail users the ability to create various slides containing textual and multimedia informations that can be used during a presentation.
Some of the features available on Microsoft PowerPoint are narrations, transition effects, custom slideshows, animation effects, formatting options etc.
Presentation can be defined as an act of talking or speaking formally to an audience in order to explain an idea, piece of work, project, and product with the aid of multimedia resources or samples.
Basically, any speaker who wish to create an effective presentation should endeavor to interact frequently with the audience by holding a conversation.
An index card can be defined as a small card (usually measuring 4 inches by 6 inches or 3 inches by 5 inches) that are used for recording informations, mostly in an alphabetical order. This card was developed in 1760 by Carl Linnaeus and is essentially suitable for presentations because they can be used to store discrete data such as addresses, notes, telephone numbers, etc.
Hence, using index cards will improve a presentation because they keep the presenter from reading the speech, as he would only have to look at the jotted points or piece of information.