Why is tf.Variable used?

Did not get why tf.Variable is used for? Someone can through some light?

Variables are created and tracked via the tf.Variable class. A tf.Variable represents a tensor whose value can be changed by running operations on it. Specific operations allow you to read and modify the values of this tensor. Hence, a TensorFlow variable is the recommended way to represent the different states that your program is currently manipulating.

Thanks Prof Julian. Its clear now.

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