What does caching & indexing of web pages mean?

Search Engines like Google, msn etc takes a snapshot of each web page it examines and caches (stores) that version as a back-up. The cached version is what Google uses to judge if a page is a good match for your query.

An index is a system used to make finding information easier. Search Engines use this method to create a table of relevant websites onto the server to be fetched as & when required.
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