Alexa Skills are voice-driven capabilities that enhance the functionality of Amazon Alexa, a virtual assistant. These skills allow users to perform various tasks, such as playing music, controlling smart home devices, or getting news updates, simply by using voice commands. Developers can create and publish their own skills through the Alexa Skills Kit, which provides tools and resources for building. Users can enable these skills through the Alexa app or by asking Alexa to activate them, making it easy to customize their experience and access a wide range of services.