What is the difference between isolating and shielding transformer?

Isolating transformer: This transformer is used to provide isolation between primary and secondary to protect the winding from the faults.

Shielding transformer: In high power applications the isolation transformers are provided with shielding plates between primary and secondary to reduce the high frequency noise in the transformer. When high frequency surge pulse is introduced in system, the capacitor near primary winding creates a short circuit path and diverts this pulse to the ground.