The Probate Code defines trusts as either express trusts, or trusts implied through court action.
Implied trusts are of two kinds: resulting trusts and constructive trusts.
A resulting trust is imposed by law where circumstances show that the transferee was not intended to take a beneficial interest in the property. A resulting trust carries out the inferred intent, where there was no expressed intent of the parties. The trustee of a resulting trust has no duty other than to transfer the property to the implied beneficiary.
A constructive trust (or involuntary trust) is really more of a remedy than a trust and is imposed by a court of equity to redress a wrong (such as fraud) or prevent unjust enrichment.