| Google |
Library Databases |
| Aims at providing a few good results |
Aims at a precise, controlled result set |
| Results are ranked by the number of times pages have been linked to |
In keyword search results, usually rank by a relevancy algorithm; if a more precise, field-targeted search, probably not by relevance. |
| SE searches every word on a page |
Usually searches metadata as default; it is often possible to change a setting to match every word within a full-length article, ebook or other source |
| Results are mostly free, but not all |
Results free to subscribers and often include copyrighted material |
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