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The current transformer consists of a primary winding, a magnetic core and a secondary winding. The alternating current in the primary produces an alternating magnetic field in the core, which then induces an alternating current in the secondary winding circuit. CT in my studies was used to protect load from high current.----------------------------------------N.B
CT can be Computed tomography which is completely different term.
If your question is about "current transformer" then it is used to measure the current consumed by the AC high load and it is always connected in series to the load as Ammeter.
it is same as the normal transformer which is used but the thing is it reduces the high current being produced in the secondary winding and provides convenient transmit of power and also an ammeter is placed to see the ampere reading