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 smart speakers, virtual assistants like Siri and Alexa, and even in cars. 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. They can help users set reminders, play music, or control smart home devices simply by speaking. As technology advances, VUIs are becoming more intuitive and capable of understanding natural language.