Voice assistants are AI-driven software applications that can understand and respond to spoken commands. They are designed to help users perform tasks, answer questions, and control smart devices using natural language. Popular examples include Amazon Alexa, Google Assistant, and Apple Siri. These assistants utilize advanced machine learning and natural language processing techniques to interpret user requests. They can perform a variety of functions, such as setting reminders, playing music, and providing weather updates, making everyday tasks more convenient and efficient.