【中文版】

联通是中国的一家大型综合性电信运营商，其经营范围涵盖了固定通信业务、移动通信业务、数据通信业务等领域。联通属于通信行业，其主营业务是提供电信服务，包括电话、宽带、移动通信等。

联通作为中国通信行业的领军企业之一，在技术创新、服务质量、品牌形象等方面都具有很强的竞争力。联通在国内外市场都拥有广泛的客户群体，其产品和服务覆盖了个人、家庭、企业等各个领域。

随着信息技术的不断发展和应用，联通也在积极拓展新兴业务领域，如云计算、大数据、物联网等。这些新兴业务将为联通带来新的增长点，推动公司向综合信息服务商转型。

总的来说，联通属于通信行业，其主营业务是提供电信服务。随着信息技术的不断发展和应用，联通也在积极拓展新兴业务领域，为未来的发展奠定了坚实的基础。

【英文版】

China Unicom is a large-scale integrated telecom operator in China, with a business scope covering fixed communication services, mobile communication services, data communication services and other fields. China Unicom belongs to the telecom industry, and its main business is to provide telecom services, including telephone, broadband, mobile communication, etc.

As one of the leading enterprises in China's telecom industry, China Unicom has strong competitiveness in technological innovation, service quality, brand image and other aspects. China Unicom has a wide customer base at home and abroad, and its products and services cover individuals, families, enterprises and other fields.

With the continuous development and application of information technology, China Unicom is also actively expanding emerging business areas such as cloud computing, big data, and the Internet of Things. These emerging businesses will bring new growth points to China Unicom and promote the company's transformation into a comprehensive information service provider.

In general, China Unicom belongs to the telecom industry, with its main business being to provide telecom services. With the continuous development and application of information technology, China Unicom is also actively expanding emerging business areas, laying a solid foundation for future development.