iCloud Photos and My Photo Stream can help you get your photos on your Apple devices and on your PC. What’s the difference between them? Learn more about both features.
Back in its day, I always found Photo Stream a little confusing; iCloud Photos makes way more sense, and has been solid for years. However, this feature still exists, at least for most people.
Interestingly, it seems that Apple has done away with Photo Stream, at least for new accounts, according to a footnote on this page:
If you recently created your Apple ID, My Photo Stream might not be available. Use iCloud Photos to keep your photos and videos in iCloud.