Office 365 groups (recommended) are a great way for teams to collaborate by giving them a group email and a shared workspace ...

Office 365 groups (recommended) are a great way for teams to collaborate by giving them a group email and a shared workspace for conversations, files, and calendar events.

Distribution lists send email to all members of the list. You can even allow people outside your organization send email to a list.

Mail enabled security groups can be used to control access to OneDrive and SharePoint as well as to send email to all members of the list.