In economics, a transaction is the operation in which a good, value or asset is exchanged for money, in which both a seller and a buyer participate. Within computing, a transaction can refer both to the internet protocol that is responsible for protecting any data concerning credit cards or the handling of a highly complex data structure. In law, transactions are those documents in which both parties consider the litigation to be over, especially the one that is doubtful. In the field of psychology, specifically transactional analysis, transactions are the interactions within a person’s ego states.

Financial transactions are characterized by being divided into two phases: the delivery of goods and the receipt of money for them; these imply changes in the economy of the participating individuals. In computing, secure electronic transactions (SET) were designed at the request of the companies in charge of VISA and MasterCard, in the mid-1990s, in order to provide security to users at the time to enter your bank details on the internet; however, due to its high cost, it soon fell into disuse and was replaced by 3-D Secure. Data structures, on the other hand, need transactions to work correctly, that is, the application of certain processes constantly, so that the structure manages to finish all of them before being reached by the system.

In the legal field, the transactions are characterized by being bilateral, which means that they are carried out by the two parties involved in the litigation; This characteristic distinguishes it from novations, those processes in which litigation obligations are also extinguished, but which is carried out by only one of the parties. In psychology, transactional analysis is a method of psychotherapy, proposed by Eric Berne in 1950; Within this, transactions are studied, whose existence determines the reactions and behavior of an individual in certain situations. These can be complementary, crossed, posterior angular and posterior double.