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When developing with frameworks like jQuery Mobile, plug-ins can help you easily enhance your functionality. Plug-ins are functions or methods that come packed together that can be added to help with special effects, change default behavior, or help with some of your logic.
jQuery Mobile is new, so the amount of plug-ins is not as large as say the original jQuery framework. However, as it continues to gain popularity, more developers will use it and release plug-ins to help others do what they have already done. This is beneficial for developers who know what they want, but are unsure of how exactly to do it. The part that I love most about plug-ins is digging through the source code so I can tell what they are doing, and so I can modify it to fit my exact needs.