I’ll also show you how to convert a regular mailbox and back as well as troubleshooting and licensing. If you’re a Microsoft 365 admin then this is a skill that you must know.
Shared mailboxes make it easy for a group of people in your company to monitor and send email from a common account, such as info@contoso.com or support@contoso.com.
https://learn.microsoft.com/en-us/exchange/collaboration-exo/shared-mailboxes
It's easy to create shared mailboxes so a group of people can monitor and send email from a common email addresses, like info@contoso.com
A shared mailbox makes it easy for a group of people to monitor and send email from a public email alias like info@contoso.com.