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Showing content from https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.security/get-credential below:

Get-Credential (Microsoft.PowerShell.Security) - PowerShell | Microsoft Learn

Gets a credential object based on a user name and password.

Get-Credential
    [[-Credential] <PSCredential>]
    [<CommonParameters>]

Get-Credential
    [[-UserName] <String>]
    [-Message <String>]
    [-Title <String>]
    [<CommonParameters>]

The Get-Credential cmdlet creates a credential object for a specified user name and password. You can use the credential object in security operations.

The Get-Credential cmdlet prompts the user for a password or a user name and password. You can use the Message parameter to specify a customized message for the prompt.

In Windows PowerShell 5.1 and earlier, Windows presents a dialog box to prompt for a user name and password. In PowerShell 6.0 and later, the prompt is presented in the console for all platforms.

$c = Get-Credential

This command gets a credential object and saves it in the $c variable.

When you enter the command, you are prompted for a user name and password. When you enter the requested information, the cmdlet creates a PSCredential object representing the credentials of the user and saves it in the $c variable.

You can use the object as input to cmdlets that request user authentication, such as those with a Credential parameter. However, some providers that are installed with PowerShell do not support the Credential parameter.

$c = Get-Credential -Credential User01
$c.Username
User01

This example creates a credential that includes a user name without a domain name.

The first command gets a credential with the user name User01 and stores it in the $c variable. The second command displays the value of the Username property of the resulting credential object.

$Credential = $Host.UI.PromptForCredential(
    "Need credentials", "Please enter your user name and password.", "", "NetBiosUserName")

This command uses the PromptForCredential method to prompt the user for their user name and password. The command saves the resulting credentials in the $Credential variable.

The PromptForCredential method is an alternative to using the Get-Credential cmdlet. When you use PromptForCredential, you can specify the caption, messages, and user name that appear in the prompt.

For more information, see the PromptForCredential documentation in the SDK.

This example demonstrates how to create a credential object identical to the one returned by Get-Credential.

$User = "Domain01\User01"
$PWord = Read-Host -Prompt 'Enter a Password' -AsSecureString
$credentialParams = @{
    TypeName = 'System.Management.Automation.PSCredential'
    ArgumentList = $User, $PWord
}
$Credential = New-Object @credentialParams

The first command assigns the username to the $User variable. Ensure the value follows the "Domain\User" or "ComputerName\User" format.

The second command uses the Read-Host cmdlet to create a secure string from user input. The Prompt parameter requests user input, and the AsSecureString parameter masks the input and converts it to a secure string.

The third command uses the New-Object cmdlet to create a PSCredential object from the values stored in the $User and $PWord variables.

$credentialParams = @{
    Message = "Credential are required for access to the \\Server1\Scripts file share."
    UserName = "Server01\PowerUser"
}
Get-Credential @credentialParams

PowerShell Credential Request
Credential are required for access to the \\Server1\Scripts file share.
Password for user Server01\PowerUser:

This command uses the Message and UserName parameters of the Get-Credential cmdlet. This command format is designed for shared scripts and functions. In this case, the message tells the user why credentials are needed and gives them confidence that the request is legitimate.

Invoke-Command -ComputerName Server01 -ScriptBlock {Get-Credential Domain01\User02}

PowerShell Credential Request : PowerShell Credential Request
Warning: This credential is being requested by a script or application on the SERVER01 remote
computer. Enter your credentials only if you trust the remote computer and the application or script
requesting it.

Enter your credentials.
Password for user Domain01\User02: ***************

PSComputerName     : Server01
RunspaceId         : 422bdf52-9886-4ada-ab2f-130497c6777f
PSShowComputerName : True
UserName           : Domain01\User01
Password           : System.Security.SecureString

This command gets a credential from the Server01 remote computer. The command uses the Invoke-Command cmdlet to run a Get-Credential command on the remote computer. The output shows the remote security message that Get-Credential includes in the authentication prompt.

Specifies a user name for the credential, such as User01 or Domain01\User01. The parameter name, -Credential, is optional.

When you submit the command and specify a user name, you're prompted for a password. If you omit this parameter, you're prompted for a user name and a password.

Starting in PowerShell 3.0, if you enter a user name without a domain, Get-Credential no longer inserts a backslash before the name.

Credentials are stored in a PSCredential object and the password is stored as a SecureString.

Specifies a message that appears in the authentication prompt. This parameter is designed for use in a function or script. You can use the message to explain to the user why you are requesting credentials and how they will be used.

This parameter was introduced in PowerShell 3.0.

Sets the text of the title line for the authentication prompt in the console.

This parameter was introduced in PowerShell 6.0.

Specifies a user name. The authentication prompt requests a password for the user name. By default, the user name is blank and the authentication prompt requests both a user name and password.

This parameter was introduced in PowerShell 3.0.

This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutBuffer, -OutVariable, -PipelineVariable, -ProgressAction, -Verbose, -WarningAction, and -WarningVariable. For more information, see about_CommonParameters.

You can't pipe objects to this cmdlet.

This cmdlet returns a credential object.

You can use the PSCredential object that Get-Credential creates in cmdlets that request user authentication, such as those with a Credential parameter.

The Credential parameter is not supported by all providers that are installed with PowerShell. Beginning in PowerShell 3.0, it is supported on select cmdlets, such as the Get-Content and New-PSDrive cmdlets.

• PromptForCredential

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