Why is understanding the 'purpose' of a source crucial when evaluating its credibility?

Understanding the 'purpose' of a source is crucial when evaluating its credibility because it reveals potential biases, motivations, and underlying agendas that may influence the information presented. The purpose of a source could be to inform, persuade, entertain, sell, or advocate for a specific viewpoint. Recognizing the author's or organization's intention helps determine the objectivity and reliability of the information. For example, a news article from a reputable news organization may aim to inform, while a sponsored article may have a persuasive purpose, potentially influencing the selection and presentation of information. Understanding the purpose allows one to assess how the source's goals might affect the accuracy and completeness of the information provided, enabling a more informed judgment of its credibility.