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Circumstantial evidence is characterized by its ability to support a conclusion indirectly rather than proving it directly. This type of evidence provides context that can lead to an inference; it does not establish proof but rather contributes to a broader understanding of a particular situation or claim. In legal contexts, for example, circumstantial evidence may consist of occurrences or facts that suggest a conclusion is likely, even if it cannot be definitively proven. This means that while such evidence can be compelling and influential in constructing a narrative, it requires interpretation and is typically considered in conjunction with other forms of evidence.

The other options represent different types of evidence or concepts that do not align with the definition of circumstantial evidence. Direct evidence provides straightforward proof of a claim, best practices refer to established methods rather than types of evidence, and irrelevant evidence fails to relate to the situation at hand. Understanding the nature of circumstantial evidence is essential in fields such as security and law, as it helps in analyzing situations where direct evidence may not be available.