Business correspondence refers to all written communications used in business activities, including business letters, emails, faxes and memos. It plays several vital functions in commercial transactions.
商务信函指商务活动中所有书面沟通，包括商务信件、电子邮件、传真以及备忘录。它在商业交易中具备多项重要功能。
First of all, business correspondence serves the communicative function. It is a major channel for companies to exchange information with customers, suppliers and partners. People make inquiries, offer information, state demands and express opinions through written messages.
第一，商务信函具备交际功能。它是企业与客户、供应商、合作伙伴交换信息的主要渠道。人们通过书面函件进行询盘、提供资料、陈述诉求、表达观点。
Secondly, it has the record‑keeping function. Written business correspondence creates permanent written records of business events. It keeps track of offers, orders, agreements and complaints. These documents can be filed for future reference and serve as valid evidence in case of disputes.
第二，档案记录功能。书面商务信函为商务事件留下永久性文字记录，保存报盘、订单、协议、投诉相关内容。这些文件可以归档以备日后查阅，发生纠纷时可作为有效凭证。
Thirdly, business correspondence performs the promotional function. Well‑written letters or emails can promote products and services, attract potential clients, expand market share and build good business relationships. Friendly and professional writing helps establish and maintain corporate image.
第三，促销推广功能。措辞得体的信函或邮件可以推销产品与服务，吸引潜在客户，扩大市场份额，建立良好业务关系。专业友好的行文有助于树立和维护企业形象。
Finally, it carries the legal function. Under certain conditions, business correspondence can become legally binding documents. Letters concerning offers, acceptance and contracts may produce legal effects for both sides of the transaction.
最后，法律功能。在特定条件下，商务信函可以成为具有法律约束力的文件。涉及报盘、接受、合约的函件会对交易双方产生法律效力。
To sum up, business correspondence is not merely a tool for message exchange. It connects business parties, keeps records, promotes business and may generate legal consequences.
总而言之，商务信函不只是信息传递工具。它联结交易各方、留存业务记录、促进业务开展，还可能产生法律后果。