In PowerPoint you can record timings to make your PowerPoint automatic or for exporting presentations to video.
This is how many of the tutorial videos are produced for this site but if there are timings in your presentation but you want it to be a completely manual then you can clear the timings, or disable them.
To clear them
Select the Slide show tab on the ribbon and click on the stopwatch with the red dot. Move your mouse over clear and select clear timings for this slide, or clear timings for all slides.
To disable them
Select the Slide show tab on the ribbon and uncheck timings. Your timings are still associated with the slide, but they have been turned off. By default PowerPoint plays back timings during a presentation.