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An invoice is generally a required document in international trade and customs processes, as it provides essential information about the transaction, including the description of the goods, their value, and the terms of sale. However, for non-commercial transactions, an invoice is not typically necessary because these transactions do not involve a sale or exchange of goods for a profit.

In non-commercial contexts, such as gifts or personal items sent between family members and friends, the purpose is not to conduct business. Thus, no traditional invoice is needed because these transactions often do not carry the same regulatory oversight as commercial ones. Instead, other forms of documentation such as a customs declaration may suffice to indicate the nature and value of the item being sent.

In contrast, trade shows generally require invoices to facilitate the temporary entry of goods and demonstrate the value of inventory being showcased. Similarly, shipments of low-value commercial items may still need invoices to comply with customs regulations, even if a simplified declaration can be used in such cases. For shipments involving personal items, invoices might not be strictly required, but it often depends on the specific regulations of both the exporting and importing countries.