Slideshare is an online presentation platform that allows users to embed slides into other web pages, share videos, and has over 60 million monthly users. While it offers automatic saving and sharing features, the document indicates it may be too complex for elementary and middle school students and has limited customization options compared to PowerPoint. PowerPoint, on the other hand, provides more design flexibility and is easier to follow along with but lacks some of Slideshare's collaborative features. Overall, the document compares and contrasts the pros and cons of Slideshare and PowerPoint for different age groups and purposes.