why is running scripts disabled on this system code example

Example 1: \Activate.ps1 cannot be loaded because running scripts is disabled on this system. For more information, see about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170

Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser

Example 2: loaded because running scripts is disabled on this s

PS C:\> Set-ExecutionPolicy RemoteSigned