To know about transient , first we need to know about serialization concept .serialization makes an object's state persistent . It means that the object is converted into stream and store in a file . For any object which has to be transmitted over network needs to be converted into bytes .when you specify transient you don't want the variable to be serialized .usually variables are marked as transient when they can be calculated from other variables .e.g . Say we know length and breadth of rectangle , then we can mark area of rectangle as transient since area is calculated from other variables.hope this helps!

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