What are the main computer application systems in modern hotels?

Including enterprise information computer management, e-commerce, economic information management and computer application, information management and information system, computer-aided design and manufacturing, database application and information management, microelectronics control technology, computer-aided manufacturing technology, computer system maintenance technology, electromechanical equipment and microcomputer application, computer control technology, computer-aided design, factory computer centralized control, computer assembly and maintenance, computer graphics and image processing, Computer art design, computer network engineering and management, information and communication network application technology, information and multimedia technology, multimedia and network technology, computer network technology, advertising computer production, computer graphics processing and plate making, computer drawing, electronic engineering, computer network and software application, network technology and information processing, numerical control technology and application, electrical appliances and computers, information processing and automation, computers and postal communication, Computer-aided mechanical design, computer and information management, public automation technology, microcomputer and its application, electronic technology and microcomputer application, communication technology, operation and maintenance of public automation equipment, computer application and maintenance, computer application technology, computer communication, electronic and information technology, computer science education, computer software, computer and its application, applied electronic technology, microelectronics technology, software engineering, information engineering, Electronic science and technology, communication engineering, electronic information engineering, automation, biomedical engineering, network engineering, computer and automatic detection, computer application and security management, network and information security, information security, microelectronics, electronic information science and technology, information science, computational mathematics and its application software, information and computing science, computer art design, Internet advertising design, publishing and computer editing technology, modern information technology education, educational information technology, and