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Circumstantial evidence refers to evidence that relies on an inference to connect it to a conclusion of fact. It suggests a proposition or a fact without directly proving it. For instance, if a person's fingerprints are found at a crime scene, it implies their possible presence there, but does not directly establish that they committed a crime. Thus, circumstantial evidence allows for reasonable deductions to be made regarding the involvement of a person or the occurrence of an event.

The other types of evidence mentioned, such as direct evidence, witness testimony, and documentary evidence, provide different levels and forms of proof but do not fall under the definition of circumstantial evidence. Direct evidence provides a straightforward connection to a fact without inference, and witness or documentary evidence offers specific forms of proof that do not rely on implications or inferences. Therefore, the distinction lies in the nature of the connection to the facts being established, which is why the answer indicating that circumstantial evidence suggests a fact without proving it is accurate.