CSS Value String
A String in CSS is a text value assigned to a property. Strings are a sequence of characters enclosed in either single or double quotes.
Example: 'GeeksForGeeks' is a String "GeeksForGeeks" is a String
quotes inside a string are not allowed and needs to be escaped with a \ like “this is a \”(double quote) “.
All text values other than the CSS keywords that are enclosed in double-quotes or single quotes are considered as strings in CSS.
content property in CSS takes in a String (contents to be inserted) as value.
Another example would be to assign background image. The URL to the background image would be enclosed in a double quote which indicates that the background-image property takes in a string value