Alexa skills are third-party applications that increase the functionality of the assistants. Its activation is done by activating it by voice. To do this, you have to activate the assistant using the word Alexa followed by the name of the skill. Once done, Alexa will open the skill and we can use its functionalities.
From Alice65 we are working to allow launching skills by pressing an IoT device. This functionality allows opening a wide range of usability possibilities by not depending on human action for our skill to run.