An Information Retrieval System is a technology designed to help users find and access information from large collections of data. These systems use various algorithms and techniques to search through databases, documents, or the internet, returning relevant results based on user queries. Common examples include search engines like Google and digital libraries. These systems typically involve indexing, which organizes data to make retrieval faster and more efficient. Users input keywords or phrases, and the system matches these with indexed content, providing a list of results ranked by relevance. This process is essential for managing the vast amounts of information available today.