One of the key features of WordPress is the fact that it's so expandable. It offers the ability to add both plugins and themes to enrich your website. One other option is to use a framework. This way, you receive a bolt-on solution that covers the scope of many plugins all built into one easy to use interface within the WordPress backend.
For example, RichWP and Thesis are both frameworks that support child themes, themes that inherit the added functionality that the framework provides you. Here's what a framework can do for you:
-Manage the CSS from the backend
-Add RSS feed URL if it's outside of WordPress itself
-Add Google Analytics codes easily
-Control the frontend without the need for CSS
-SEO optimization for your site
-Add Advertisement boxes where you'd like
-Change the presentation / content of the header and footer when you'd like
-Change site fonts and background images on-the-fly
-Most frameworks have great support & frequent updates
-Font Replacement with CSS3 and @font-face
Although frameworks often have a price associated with them, They're well worth the buy if you plan to have a near omnipotent control over your website and make changes as you please. Some would say that WordPress is only half of the deal, and using a framework completes the experience. Others live by the WordPress core and choose to use as little amount of addons as possible. What I personally like about frameworks is that it's like having many powerful plugins built into one system.
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