A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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a robots tag used to instruct search engines not to keep a cached copy of the webpage the tag applies to.
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a service that provides information about the indexing of sites on the Yandex search engine. This service informs Yandex about web pages that appeared or have been deleted.
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an experimental protocol for multiplexing multiple, concurrent streams (typically HTTP request/response streams) over a single TCP connection.
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a number of marketing techniques and practices that utilizes existing social networking dynamics.
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