A will or testament is a legal declaration by which a person, the testator, names one or more persons to manage his estate and provides for the transfer of his property at death. A will may also create a testamentary trust that is effective only after the death of the testator.
After the testator has died, a probate proceeding may be initiated in court to determine the validity of the will or wills that the testator may have created, i.e., which will satisfy the legal requirements, and to appoint an executor.
A trust is a relationship whereby property (real or personal, tangible or intangible) is held by one party for the benefit of another. A trust conventionally arises when property is transferred by one party to be held by another party for the benefit of a third party, although it is also possible for a legal owner to create a trust of property without transferring it to anyone else, simply by declaring that the property will henceforth be held for the benefit of the beneficiary.