Lets understand what is MongoDB URI?
MongoDB URI is a connection string which usually uses for connecting MongoDB server and client. for example
mongodb+srv://brigitte:bardot@xyz-1234.srv.net/admin
mongodb+srv
this is call srv uri string. SRV string start with mongodb+srv prefix which tell mongodb server uri string.
brigitte:bardot
here brigitte is mongodb server credential user name. bardot is password
xyz-1234.srv.net
xyz-1234.srv.net is host name
admin
admin is authenticate database. that crential is match into this database.