Difference between Session and Query String

Querystring	Session
Querystring is client side state management technique.	Session is server side state management technique.
Querystring data is page specific i.e. can be accessed in that page only.	Session data can be accessed throughout the session.
Querystring data is visible to user and can be seen in browser url.	Session data is not visible to user.
Data is not secured and can be altered hence insensitive data is stored in querystring.	Data is secured hence sensitive data such as user information is stored.
Querystring has constraint of Maxlength.	Session does not have such constraint.
Querystring passed through url like www.abc.com?myparam=12.	Session created in application like Session["mysession"] = somevalue.
Querystring fetched on page like string myvalue = Request.QueryString["myparam"].	Session retrived in application like string myvalue = Session["mysession"].