Session variables are used to store user specific information where as in application variables we can't store user specific information.
Default lifetime of the session variable is 20 mins and based on the requirement we can change it.
Application variables are accessible till the application ends.
sessions allows information to be stored in one page and accessed in another,and it supports any type of object,including your own custom data types.
Application state allows you to store global objects that can be accessed by any client.
The coomon thing b/w session and application is both support the same type of objects,retain information on the server, and uses the same dictionary -based syntax.
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