{! } - Anything inside this format is used to assign values dynamically
$- Prefix is used to denote global action
& - character is the formula language operator that concatenates strings.
$Resource - For static Resource
URLfor() - For combining zipped static resource
*when the {! contacts } expression is evaluated. On this page, Visualforce translates that expression into a call to your controller’s getContacts() method.
The getContacts() method is called a getter method
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