Microsoft 365 Business Basic includes Office Online, hosted email, and 1TB of file storage per user.
Microsoft 365 Business Standard includes fully installed Office applications across multiple devices, hosted email, and online file storage and sharing.
Microsoft 365 Apps for Business includes fully installed, desktop versions of Office applications such as Word, PowerPoint, and Excel. These work across multiple devices plus you'll also get online file storage and sharing.
Microsoft Office 365 E1 includes Office Online, hosted email with a 50 GB mailbox per user, team sites to promote collaboration, and Skype for Business conferencing.
Microsoft Office 365 E3 includes fully installed Office applications across multiple devices, email hosting, HD video conferencing, and features to support compliance.
Microsoft Office 365 E5 includes fully installed Office applications across multiple devices, email hosting, HD video conferencing, and extended features to support compliance.