Federal Rule of Civil Procedure 26 governs the process of discovery in civil litigation, outlining the scope and limits of what parties can obtain from each other to prepare for trial. This rule sets forth the guidelines for mandatory disclosures, including what information must be shared without a request, while also defining the boundaries to prevent excessive or irrelevant discovery requests. It is crucial in managing the flow of information and ensuring that all parties have access to relevant evidence while minimizing disputes.