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Do-loops are useful when you always want to run a codeblock at least once. A Do-loop will evaluate the condition after executing the codeblock, unlike a while-loop which does it before executing the codeblock.

You can use do-loops in two ways: 

Do {
    code_block
} while (condition)
Do {
    code_block
} until (condition)

Real Examples: 

$i = 0

Do {
    $i++
    "Number $i"
} while ($i -ne 3)

Do {
    $i++
    "Number $i"
} until ($i -eq 3)

Do-While and Do-Until are antonymous loops. If the code inside the same, the condition will be reversed. The example above illustrates this behaviour.

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Loops:
* Loops
* Foreach
* For
* ForEach Method
* ForEach-Object
* Continue
* Break
* While
* Do
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