中文版：

充电协议是什么？

随着智能手机的普及，人们对于充电的需求也日益增长。而充电协议就是一种规范和标准，用于规定手机、平板等设备在充电过程中应该遵循的规则和流程。充电协议的出现，使得各种不同品牌、不同型号的设备能够使用相同的充电器进行充电，从而提高了充电的效率和便捷性。

目前，市面上最流行的充电协议包括USB-C PD、QC、VOOC等。其中，USB-C PD是最为普及的一种充电协议，它支持USB-C接口，可以通过协商电压和电流实现快速充电。而QC（Quick Charge）和VOOC（Voltage Open Protocol）则是两种比较常见的私有充电协议，它们都支持通过协商电压和电流来实现快速充电，但不适用于所有设备。

除了私有充电协议外，还有一些公开的充电协议，如USB-IF组织制定的USB Power Delivery（USB-PD）协议。USB-PD是一种基于USB Type-C接口的充电协议，它可以通过协商电压和电流实现快速充电，同时支持更高的功率传输。

总之，充电协议是一种规范和标准，用于规定设备在充电过程中应该遵循的规则和流程。不同的充电协议适用于不同的设备和应用场景，用户需要根据自己的需求选择合适的充电器和充电协议。

英文版：

What is charging protocol?

With the popularity of smartphones, people's demand for charging is also increasing. Charging protocol is a specification and standard that governs the rules and procedures that devices such as phones and tablets should follow during the charging process. The emergence of charging protocols allows various different brands and models of devices to charge using the same charger, thereby improving the efficiency and convenience of charging.

Currently, the most popular charging protocols on the market include USB-C PD, QC, VOOC, etc. Among them, USB-C PD is the most widely used charging protocol, which supports the USB-C interface and can achieve fast charging through negotiation of voltage and current. QC (Quick Charge) and VOOC (Voltage Open Protocol) are two common private charging protocols that support fast charging through negotiation of voltage and current, but are not applicable to all devices.

In addition to private charging protocols, there are also some public charging protocols, such as the USB Power Delivery (USB-PD) protocol developed by the USB-IF organization. USB-PD is a charging protocol based on the USB Type-C interface that can achieve fast charging through negotiation of voltage and current, while supporting higher power transmission.

In summary, charging protocol is a specification and standard that governs the rules and procedures that devices should follow during the charging process. Different charging protocols are suitable for different devices and application scenarios. Users need to choose appropriate chargers and charging protocols based on their needs.