Source: "Should I be using Google or the Library resources for a paper?" by NEIU Libraries, is licensed under a Standard YouTube License.Learn about how searching library resources is different than searching Google.
For a quick overview... Google, Bing, and Yahoo! are not databases. They are part of the "surface web," which indexes, or has access to, less than 10% of what's available online. There is so much more to the world wide web than Google!
Image source: "What is Deep Web?" by Quora, used under "fair use" copyright guidelines
Rather, Google, Bing, Yahoo!, etc., are robust and sophisticated search engines that deliver quick results. They point to information available on the web but don't always give you access. Most of the time, these results are less organized and may or may not directly apply to your needs. You can think of Google as a map, or perhaps akin to one of those information booths at fairs or large events where someone asks you..."You need to know where such and such is? Great! Here's some information. Try looking over there or over there." Search engines quickly look through words on web pages and by the use of search words (and ranking status) offer you links to other web pages. In essence, a search engine merely points you to possible information, which may or may not be available for free, and is certainly not comprehensive.