Immutable is nothing but, once we create an object we cant perform any changes in that object. If we try to change new object will create default.
In python same object can be used by multiple references. If one person try to change the content remaining people also will be effect to prevent that if any person try to change content in the existing shouldn’t be changed default new object will create.
NOTE: Immutable nothing but Non Changeable and Mutable nothing but Changeable.