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A photo album is a collection of photos, usually on a specific topic or taken at a specific place or event. You can post and share photo albums on Google+ just like you do individual photos.
Tip: Use a Photo Album to Post a Slide Deck on Google+
You can also use a photo album to post a slide deck on Google+. For example, export all the slides in a PowerPoint presentation to images and post them as an album. Your Google+ network can comment on each slide/photo individually or the presentation as a whole.
Google+ enables you to create a photo album from the share box on your stream and Google+ bar, the Photos page, or the Photos tab on your profile. The process is similar for all three.