A Voice User Interface (VUI) allows users to interact with devices using spoken commands instead of traditional input methods like keyboards or touchscreens. This technology is commonly found in devices such as smart speakers, smartphones, and virtual assistants like Amazon Alexa and Google Assistant. VUIs use speech recognition to understand user requests and provide responses or perform tasks. The main advantage of VUIs is their hands-free operation, making them convenient for multitasking or when users cannot physically interact with a device. They can perform various functions, including playing music, setting reminders, and controlling smart home devices, enhancing user experience and accessibility.