Modules were introduced with PowerShell 2. A module groups a set of commands together, most often around a common system, service, or purpose.

PowerShell uses several different types of module, such as manifest, binary, and script. A manifest module is typically made up of a set of nested modules. A binary module uses a compiled library (.dll file) to implement commands. This chapter focuses on script modules.

In this chapter we will cover the following topics:

• Module layout
• Multi-file module layout
• Module scope
• Module initialization and removal