中文：

主板，又称主机板、系统板或母板，是一台计算机最基本的组成部分之一。它通常是一块矩形电路板，上面安装了计算机的主要电路、芯片、扩展卡和各种接口等。主板是计算机中最重要的部件之一，它决定了计算机的基本性能和功能。

主板上安装了CPU、内存、硬盘、显卡等主要的计算机部件。它提供了这些部件之间的连接和通信，并协调它们的工作。主板的性能会直接影响计算机的性能和稳定性。

主板的型号和规格因制造商和用途而异。不同的主板可能会采用不同的芯片组、扩展槽和接口等。因此，在购买主板时，需要根据自己的需求和预算选择适合自己的型号。

英文：

Mainboard, also known as motherboard, system board, or daughterboard, is one of the most basic components of a computer. It is typically a rectangular circuit board that installs the computer's main circuit, chips, expansion cards, and various interfaces. The mainboard is one of the most important components in a computer, which determines the basic performance and functionality of the computer.

The mainboard installs the main computer components such as CPU, memory, hard disk, graphics card, etc. It provides connection and communication between these components and coordinates their work. The performance of the mainboard directly affects the performance and stability of the computer.

The models and specifications of mainboards vary by manufacturer and use. Different mainboards may adopt different chipsets, expansion slots, and interfaces. Therefore, when purchasing a mainboard, it is necessary to choose a suitable model based on one's own needs and budget.