What is a declaratory decree?

what is a declaratory decree/judgment? pretty sure they are the similar things ----

For example, a party to a contract may seek the legal interpretation of a contract to determine the parties' rights, or an insured may seek a determination of insurance coverage under a policy. In a will contest, a party may seek a declaratory judgment to determine who is entitled to inherit under the will or to define what part of an estate a beneficiary is entitled to receive.

For example, a party to a contract may seek the legal interpretation of a contract to determine the parties' rights, or an insured may seek a determination of insurance coverage under a policy. In a will contest, a party may seek a declaratory judgment to determine who is entitled to inherit under the will or to define what part of an estate a beneficiary is entitled to receive.

(Source)
http://definitions.uslegal.com/d/declaratory-judgment/