what is the differnce between eddy current and induced current?

Eddy currents are the( whirlpools) which induce current in circular form, not exactly as it but they are induced in solid pieces of conductor in the presence of changing magnetic fieldsAs they were discovered by Focault, they are also know as Focault current!

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Eddy currents are one case of electromagnetic induction, usually an undesired one. In this case, a varying magnetic field causes current loops in the bulk of the conductor. For example, some transformers have two coils of wire around a common iron core. When we apply AC current to one coil, there is an induced potential across the second coil that can generate induced currents if the ends of the coil are shorted or hooked up to a load. This is the desired operation of the transformer. However, at the same time, there are current loops being induced in the bulk of the iron core and we would call those eddy currents. The eddy currents are undesirable because those currents will be dissipated into heat, wasting that power instead of allowing the first coil to efficiently transfer power to the second coil. This is why transformer cores are laminated (i.e. made of sheets glued into a stack with non-conducting glue) to prevent large, power guzzling eddy from forming

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