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Served off of Google's servers.
Pro Free to use
Google Web Fonts is completely free to use.
Pro Easy-to-use interface
The Google Web Fonts interface is straight forward and quick to use, allowing you to choose specific fonts and weights then creates the link tag for you.
Con No asyncronous loading
The fonts.google.com suggest to use Typekit
Con Poor quality of some fonts
Many of the fonts provided by Google Web Fonts are of poor quality and design