Visual Studio解决方案由一个或多个项目组成。例如:控制台项目可以生成程序集。程序集在逻辑上是可以交付给客户的代码块，在物理上是。exe(可执行程序)或。dll(可被其他程序重用)。

维基百科说:

In the Microsoft .NET framework, an assembly is a partially compiled code library for use in deployment, versioning and security. There are two types: process assemblies (EXE) and library assemblies (DLL). A process assembly represents a process which will use classes defined in library assemblies. .NET assemblies contain code in CIL, which is usually generated from a CLI language, and then compiled into machine language at runtime by the CLR just-in-time compiler. An assembly can consist of one or more files. Code files are called modules. An assembly can contain more than one code module and since it is possible to use different languages to create code modules it is technically possible to use several different languages to create an assembly. Visual Studio however does not support using different languages in one assembly.

如果你真的浏览过，澄清你不理解的地方会有帮助

用更简单的术语来说:可以由. net运行时环境执行的(预编译的)代码块。. net程序由一个或多个程序集组成。

看到这个:

在Microsoft .NET框架中，程序集是用于部署、版本控制和安全的部分编译代码库

汇编是. net框架编程的基本部分。 它包含CLR在可移植可执行文件中执行MSIL(Microsoft中间语言)代码的代码，如果它没有关联的程序集清单，将不会执行。

Visual Studio解决方案由一个或多个项目组成。例如:控制台项目可以生成程序集。程序集在逻辑上是可以交付给客户的代码块，在物理上是。exe(可执行程序)或。dll(可被其他程序重用)。