The server is the core equipment that provides computing, storage and network services. The following are the key information: Core functions: responding to client requests, processing data and returning results, supporting website hosting, database management, application running, etc. Type: By architecture: tower (suitable for small and medium-sized enterprises), rack (suitable for data center), blade (high-density computing). By use: Web server (processing HTTP requests), database server (storing data), file server (sharing files), etc. Hardware composition: CPU (multi-core and multi-thread, such as Intel Xeon), memory (DDR4/DDR5, which supports ECC check), storage (SSD/HDD, which can be configured with RAID redundancy) and network card (Gigabit/10 Gigabit Ethernet). Software system: operating system (Linux/Windows Server), database (MySQL/Oracle) and middleware (such as Tomcat). Key points of purchase: Performance: Select the number of CPU cores, memory capacity and storage type according to business requirements (SSD is suitable for high-frequency reading and writing, HDD is suitable for large-capacity storage). Extensibility: Give priority to the models that support hardware upgrades (such as memory slots and PCIe slots) to meet future business growth. Reliability: Choose a server with redundant power supply and RAID configuration to ensure data security.