AI (Artificial Intelligence) refers to the field of computer science that aims to create machines capable of simulating cognitive functions similar to those of human beings, such as learning, reasoning, problem-solving, and perception. AI technology can be used to develop a wide range of applications and systems, including virtual assistants.

A virtual assistant, on the other hand, is a specific application or system that uses AI technology to provide assistance or perform tasks for users. Virtual assistants are typically designed to interact with users in natural language through voice or text interfaces, and they can perform various tasks such as scheduling appointments, setting reminders, sending messages, providing information, and controlling smart home devices.

In summary, AI is the overarching technology that enables virtual assistants to perform their tasks, while a virtual assistant is a specific application or system that uses AI technology to provide assistance to users.