Creat a literal string
$animal = 'fox' 'The quick brown $animal jumps over the lazy dog.'
Evaluate a Expression in a string
$animal = 'FOX' "The quick brown $($animal.ToLower()) jumps over the lazy dog $(2 + 3) times."
Evaluate an Variable in a string
$animal = 'fox' "The quick brown $animal jumps over the lazy dog."