Explanation

(ai) A presentation package is a software program that contains a text editor and the ability to add charts and graphic images, such as photographs, clip art, or other objects so as to make a slide show for the purpose of communicating visually to an audience.
(aii) - Microsoft PowerPoint.
       - Macromedia flash.
       - Windows movie maker.
       - Open Office
(aiii) - Presentation packages allow you to create or insert slides anywhere in a presentation.
        - They are shown on a page-by-page basis, where each page of information is called a slide.
        - Pictures, images, video and audio files can be inserted into slides.
        - Inserted slides can easily be deleted.
        - Slides can be cut and pasted in any order.
        - You can display presentation designed in the slide show systems
        - Presentation packages allow animations and sound manipulation on objects in a slide
(b) - Press Ctrl+H or go to Home > Find & Select > Replace.
     - In Find what, type the text or numbers you want to find.
     - You can further define your search: ...
     - In the Replace with box, enter the text or numbers you want to use to replace the search text.
     - Select Replace or Replace All

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