How is a chatbot best defined?

A chatbot is best defined as an application that simulates human conversation. This definition encapsulates the fundamental purpose of a chatbot, which is to interact with users in a manner that mimics human dialogue. Chatbots can process natural language input, respond to queries, and navigate tasks within a conversational framework, allowing for user-friendly interactions.

While the other options mention elements related to automation and support, they do not fully capture the essence of what a chatbot is designed to do. The focus on simulating conversation highlights the interaction aspect rather than limiting the chatbot to a specific function such as customer service, which could apply to particular applications of chatbots but is not universally defining. Additionally, filtering human interactions or being solely voice-activated does not encompass the breadth of chatbot capabilities, which may include text-based interactions across various platforms. Thus, defining a chatbot as an application that simulates human conversation is both broad and accurate, making it the most suitable choice.