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This book aims at providing a thorough and updated introduction to the key Information Retrieval (IR) concepts and technologies behind search engines. In the modern online world, seeking and finding information of value is of paramount importance and, for this, people often refer to search engines because of their inherent effectiveness and simplicity. Search engines work because they are anchored on the field of IR – the primary goal of an IR system is to retrieve all the documents that are relevant to a user information query, while retrieving as few non-relevant documents as possible. This ambitious view of the problem naturally leads to a wealth of concepts and technologies, which are required to implement the search box paradigm.