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