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What is a Session Id?

A Session ID is a unique identifier given by the server to the specific client to support communicatio between for a time period. The session ID can be stored as a cookie, form field, or URL (Uniform Resource Locator). Some Web servers generate session IDs by simply incrementing static numbers. However, most servers use algorithms that involve more complex methods, such as factoring in the date and time of the visit along with other variables defined by the server administrator.

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