Information Retrieval (IR) is the process of obtaining information system resources that are relevant to an information need from a collection of those resources. It involves various techniques and algorithms to search and retrieve data from databases, documents, and the web. The goal is to provide users with the most relevant results based on their queries. IR systems are widely used in search engines like Google and Bing, where users input keywords to find relevant web pages. These systems analyze the content and structure of documents to rank them according to their relevance, ensuring that users receive the best possible information quickly and efficiently.