According to Dienstbier (2004) what is preamble?

According to Dienstbier (2004), a preamble is an introductory statement that sets the tone for a document or a discussion. It often outlines the purpose, goals, and values that will guide the rest of the document or conversation. In the context of a research paper or article, a preamble may provide background information, define key terms, and explain the significance of the topic being discussed.