In these virtual environments the user possess total autonomy in its searches and therefore he needs easinesses that an information professional only can offer using to have access it what she needs and at any time. This must be offered in such a way in the services of traditional physical archives as in the virtual ones of Web. In the society of the information and the knowledge, the professionals of the information, each time more, are if acquiring knowledge that they play the social function to become accessible for the society the information that consist in the memory centers. With this, it is transferred if to more frequent develop centered services of information in the user. One of the ways that can be used to have themselves more success in the services is the Study of Users, therefore it becomes possible to identify to the uses and users of the quantities, contributing for the effectiveness in the development of the services. The information institutions must: To know its customers; To know the necessities of its customers, that is, to know where the users are using the archive information and as they are making use of them; to carry through organizacionais reordenamentos and of products and services, being searched to satisfy the necessities effectively of customers; to make use of the techniques of the marketing and the pedagogia with the objective to seduce and to form new customers. The adoption of an active and centered position in the customer also means the update of the standards of quality in the archives.Was intended in this work to provide, of form synthetic, but objective and very estruturante, a familiarization with the theories, research and studies on the users of the units of information. To satisfy this objective, it was opted to a description on who are the users, what they search, and which is the paper of that they work with the information and on the units of information..