Has good design and is easy to learn for first-time users.
Isn't as compatible as PowerPoint and Google Slides.
Keynote is a worthy and comparable alternative to PowerPoint. It comes included with every Mac, Macbook, iPhone, and iPad, so anyone who has these products is able to just download it for free from the Mac App Store. This is a major plus, especially for budget-minded students who can't afford the fairly expensive Microsoft Office and PowerPoint.
Even though its free, I would still recommend Google Slides and Google Drive over it because of collaboration and compatibility features that Keynote still needs work on. Google Slides has collaboration features that PowerPoint and Keynote can't compete with. PowerPoint is widely used among all ages, professions, and settings. When importing a PowerPoint into Keynote, a lot of times the fonts and formatting gets changed or altered so it doesn't look as it should. When exporting a Keynote file to PowerPoint .pptx, the same thing happens. So I would still suggest PowerPoint over Keynote to those who will be working with others who have computers of different platforms and OS's.
Overall, Keynote is a really good alternative that's easy to use and has a lot of useful features. It's free, comes with plenty of templates, and is easy to customize. Compatibility and collaboration features are still lacking, so those who really need these should probably try other alternatives first.
Comes with every Apple product, so is a free alternative to the expensive PowerPoint.