Difference between Session and Querystring

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.