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The textbook analyses information technology, which is presented as a set of processes that operate with primary information to obtain an information product. The considered expert technologies allow you to gain knowledge with greater efficiency and make the best decision in a given situation. The field of mathematical modelling of business processes and methods of decision-making with optimisation according to a given criterion is studied. Information about basic network technologies, protocols and services, search mechanisms, electronic payment systems is briefly presented, types of information and software products and possible threats to them are considered. The issues of protecting personal information and counteracting malicious software products are explored. For students of higher educational institutions of economic specialities and specialists in the development of information systems.