Among many search options in Dynamics 365, Relevance Search offers a user experience much like traditional search engines:

End-user experience

What order to configure things in

What some of the common a-ha moments are

Some nice-to-know considerations when implementing

"Points" associated with each field type: Select entities for Relevance Search

"New" online-only documentation: Online-only features

Traditional Online-vs.on-prem FAQ: Online vs on-premises features FAQ