If the judgment is for the plaintiff, then the defendant must comply under penalty of law with the judgment, which will usually be a monetary award. If the defendant fails to pay, the court has various powers to seize any of the defendant's assets located within its jurisdiction, such as:
If all assets are located elsewhere, the plaintiff must file another suit in the appropriate court to seek enforcement of the other court's previous judgment. This can be a difficult task when crossing from a court in one state or nation to another, though courts tend to grant each other respect when there is not a clear legal rule to the contrary. A defendant who has no assets in any jurisdiction is said to be "judgment-proof." The term is generally a colloquialism to describe an impecunious defendant.
Indigent judgment-proof defendants are no longer imprisoned; debtor's prisons have been outlawed by statute, constitutional amendment, or international human rights treaties in the vast majority of common law jurisdictions.
Article Source: Wikipedia.org