在电脑网络中，封装（英语：Encapsulation）是一种通信协定的设计方法，将网络功能抽象出来，对高层功能隐藏底层功能的信息。封装是各种网络协定的基本实作方法，包括OSI模型与TCP/IP都应用了封装概念在其中。

In computer networking, encapsulation is a method of designing modular communication protocols in which logically separate functions in the network are abstracted from their underlying structures by inclusion or information hiding within higher level objects.