Technically not even chocolate, it is made with cocoa butter, milk and sugar, but doesn't contain cocoa solids. As a result, it is creamy white in colour and mild and sweet in flavor. This is often used as a coating or decorative garnish.
Remember, never substitute one chocolate for another in a recipe as this will affect the flavor and may cause the dessert to fail. For best results do not substitute chocolate chips for squares either. Chips are formulated with less cocoa butter to enable them to hold their shape. Squares are specially formulated with quality ingredients to melt easier than chocolate chips.