The term "necessary documents" refers to any official or legal paperwork that is required for a particular purpose, activity or transaction. These could include identification papers such as passports, driver's licenses, birth certificates and other forms of ID; contracts, agreements, permits, visas, immigration papers, tax records, financial statements, insurance policies, medical records, legal documents, etc., depending on the specific situation. In essence, these are any documents that are required to be presented or completed in order for something to happen legally and/or officially.