As with all Google Documents, Google Slides can easily be shared since they live in the cloud, multiple users can also edit the slides and comment at the same time.

Google Slides lives in the cloud, it can be viewed and edited from virtually any platform.

Google Slides is a more back-to-basics type of presentation software, so no distractions with a multitude of options and settings.

Google Slides does offer a paid version but features are not limited by pricing.

Since Google Slides live in the cloud means there's no need to maintain the application. There's also nothing to install and nothing to update.

Being a web-platform keeps it always up-to-date, saves the trouble of errors when presenting on older versions.