Since the colonial period the Brazilian public libraries have little contributed to the democratization of the access to information. In the Information Society, the public library role takes up a vital importance to be again the great center for disseminating information, and, mainly, for disseminating the existing disparities in the socially injust Brazilian society. Since it was unable to "to be all for all", the public library can segment the market and offer rationally structures products and services, in accordance with the community information needs.
Public library; Information society