What is the function of a preamble in a document?

The function of a preamble in a document is to explain the purpose of the document. It serves as an introduction that outlines the reasons for the document's creation and the goals it aims to achieve. This vital section sets the context for the content that follows, helping readers understand the intentions behind the document and establishing the framework for the subsequent information or arguments presented.

While other options may contain elements relevant to the overall structure of a document, they do not specifically capture the essence of what a preamble is meant to accomplish. A preamble does not typically provide evidence or serve as a summary of sections, nor is it primarily focused on listing signatories. Instead, it aims to articulate the guiding principles and motivations that underpin the text, allowing readers to grasp the foundational reasons for its existence.