How are discovery systems similar to Google? How are they different?

A comparison between discovery services, such as Summon, and Google:

… similarities include the holy grail of “the one search box” that searches “everything” (or close enough) and heavy focus on relevancy ranking to surface desired results.

As a sidenote, relevancy ranking isn’t really new to library catalogues by now (for example our “next generation catalogue” Encore, has relevancy ranking and ……

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