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Outlook features automatic sorting that is built into the service. There are two main features for automatic sorting provided by Microsoft:
Focused inbox
Focused Inbox separates your inbox into two tabs — Focused and Other. Your most important emails are on the Focused tab while the rest remain easily accessible but listed in the Other tab.
To disable the Focused Inbox navigate to the View tab, select Show Focused Inbox to toggle it off.
https://support.office.com/en-us/article/Focused-Inbox-for-Outlook-f445ad7f-02f4-4294-a82e-71d8964e3978?ui=en-US&rs=en-US&ad=US#ID0EAACAAA=Outlook_2016
Junk
Junk e-mail messages, also known as spam, can be a nuisance in your Inbox. The Junk E-mail Filter in Outlook identifies messages that are likely junk and moves them to the Junk E-mail folder.