Inverted file structure

An inverted file structure is like a detailed index for a large collection of documents. Instead of listing the documents directly, it creates a map from each word to the locations where that word appears. For example, for the word "apple," the index shows all documents and places within them where "apple" is found. This organization allows quick, efficient searches to find all relevant documents containing specific words, making information retrieval faster—similar to a library index that quickly guides you to books mentioning a particular topic.