In the United States legal system, the concept of "innocent until proven guilty" means that a defendant is presumed to be innocent until the prosecution can prove beyond a reasonable doubt that they committed the alleged crime. The term "not guilty" is used to describe a verdict in which a defendant is found not to have committed the alleged crime.

While a "not guilty" verdict technically means that the prosecution failed to prove their case beyond a reasonable doubt, it does not necessarily mean that the defendant is innocent in an absolute sense. It simply means that the prosecution did not meet the high burden of proof required for a criminal conviction.

In a legal context, innocence and guilt are often nuanced concepts that depend on the specific circumstances of a case and the legal definitions of the crimes charged. While a "not guilty" verdict may suggest a defendant's innocence, it is not a conclusive determination of innocence in all cases.
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