We learned in the last two chapters that you can put a bunch of functions in a script file, and then dot-source this file to get these functions into a session. Consider the following script, called AreaFunctions.ps1:

After dot-sourcing the script file, we can use the functions and access the $pi variable as well. If we use get-command, we will find the functions but they are no longer connected in any way. That is, it is difficult to see that these functions are part of a unit. There is no data retained in the function definitions that tells us where they came from. Since one of the important points of PowerShell is that it is discoverable, this situation isn't ideal. PowerShell 2.0 introduced the concept of modules to help tie these functions (among other things) together.