Open-Domain Search refers to the process of retrieving information from a wide range of topics without any specific limitations. This type of search allows users to ask questions or input queries on various subjects, and the system provides relevant answers or data. It is commonly used in search engines and information retrieval systems. Unlike closed-domain search, which focuses on a specific area or topic, open-domain search can handle diverse queries. This flexibility makes it useful for applications like virtual assistants and chatbots, where users may seek information on anything from history to science or current events.