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Session (web analytics)
Sessions, or visits, is a unit of measurement in web analytics, capturing either a user's actions within a particular time period, or a user's actions in completing a particular task. As well as being directly useful as a metric within web analytics, sessions are also used in operational analytics and to provide personalised features, such as user-specific recommendations for other pages or items to view. These uses are dependent on session reconstruction - taking a series of user events and splitting the series into a set of sessions - which tends to use one of two classes of methodologies: ''time-oriented approaches'', which use user inactivity as a signal to end a session and begin a new one, and ''navigation-based approaches'', which divide requests into sessions based on an unbroken chain of hyperlinks between the requested pages.
== Definition ==
The definition of "session" varies, particularly when applied to search engines. Generally, a session is understood to consist of "a sequence of requests made by a single end-user during a visit to a particular site", In the specific context of search engines, "sessions" and "query sessions" have multiple, contradictory and interchangeable definitions; some researchers consider a session or query session to be all queries made by a user in a particular time period, while others argue that sessions can be divided thematically, and a "session" is a series of queries with a consistent underlying user need, and that sessions terminate when that need does, even if the user continues searching for other purposes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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