When a team is building a deck together
Instead of emailing a file back and forth and merging changes by hand, several people can open the same Google Slides file at once and edit it in real time, seeing each other's cursors and changes as they happen -- which speeds up collaboration considerably.
A few habits that make slides easier to maintain
Keeping one idea per slide, reusing a small set of layouts instead of formatting every slide from scratch, and using speaker notes for the details you'll say out loud (rather than cramming them onto the slide) all make a deck faster to build and easier to update later.
Frequently Asked Questions
Can I import an existing PowerPoint file?
Yes, uploading an existing PowerPoint (.pptx) file lets you open and edit it directly in Google Slides.
Can I work on a presentation offline?
If you enable offline access in advance in Chrome, you can keep working without an internet connection, and your changes sync automatically once you're back online.