All Mac and iOS devices such as iPhone and iPad come with a suite of office applications pre-installed. This includes Keynote, a presentation software app very similar to PowerPoint, its Microsoft counterpart.
Keynote presentations can easily be viewed on any Apple hardware, but as an application exclusive to Apple platforms, there can be compatibility issues when wanting to share a Keynote document with a Windows user. To avoid these compatibility issues between Mac and Windows, one can save Keynote documents created on Mac as PowerPoint documents that will easily be viewable on Windows.