You must first click on the text holder on the slide, (the hloder with the words) then click on the Animation pane, a side bar will show on the right side, click on the text box option (if you have more than one holder on the slide). Select the effect option on the box that appears select the animate text pull down by letter.
People use powerpoints to create presentations for large groups of people as long as there is a computer and screen to show the powerpoint on. There are many effects that can be included along with the content. This makes the presentation more enjoyable to the audience.
One way is to have the text appear on the screen instead of having the text already on the screen when the presenter clicks to the next slide. The presenter may want to do this so that she or he could ask questions to the audience before portraying the answers to the audience.
The easiest way to do this is to type the text first and then apply an entrance effect. Then set it to by letter in the effect options dialog box.