In the next Brown-bag article, you can learn more about: what really is Lightning and the benefits of using it in your next Salesforce project; how is developing on this new framework; Visualforce vs Lightning; among other useful info.
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The new Salesforce Lightning Component Framework is based on the Aura Open Source Library, that allows new ways for developers to implement their solutions into desktop and mobile devices.
It’s event driven architecture and out-of-the-box UI components provides flexibility and a wide array of development languages.