Excellent question. Assuming that you are not talking about using remote servers for database retrieval, but are actually asking how to use the web itself as a datasource. This is topic of much research which goes under the name of the Semantic Web. See the related link for the Semantic Web's homepage. Its goal is to make web content, all web content, machine readable so that software agents can collate, collaborate, and consume web data in the same manner as we currently can with databases. This technology is still in its infancy, but for more information, visit the related link.
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Data source is used to convey data symbols.
when information is taken from somewhere else then given to you ie your homework.you take it from the web then give it to your teahers.
Primary source data is when a person is actually on the scene taking random examples and questions whereas secondary source data is taken from newspapers, magazines, hearsay, Internet ..... etc
A replica.
Embedding Shadowing