The development of modern society directly depends on effective science communication, which affects all social institutions, cultural practices and economic processes. Its important function is to provide society with reliable scientific knowledge, which contributes to improving the level of education, the formation of a scientific worldview and an adequate assessment of the achievements of science and technology. On the other hand, the processes taking place in society – in the political, socio-e conomic, and technological spheres – determine the conditions for the development of science communication and the dissemination of scientific knowledge among the general population. The unique challenges typical of any state determine the level of development of science communication. For example, in Brazil, in conditions of social inequality and geographical extent that limit access to scientific infrastructure for different segments of the population, science communication has its own specifics, for example: high-quality scientific education and the latest research are available to privileged strata. Brazil’s vast territory and uneven distribution of scientific centers create natural barriers to information exchange, etc. In light of these problems, public libraries can serve as a bridge between the science community and the public, traditionally acting as intermediaries between recorded knowledge and society. The article is a review, which describes the development of science communication in Brazil, as well as ways to spread scientific knowledge in the country. Special attention is paid to the participation of libraries in science communication. The review is based on publications selected in the scientific information social network ResearchGate and the database Lens.org, and the study of the websites of public libraries in Brazil. An analysis of publications and websites has shown that today the experience of Brazilian libraries participating in science communication activities is not great, and the their main goal in popularizing scientific knowledge is to overcome information inequality and create inclusive access to scientific knowledge for all groups of the population. The library serves as an intermediary, an auxiliary tool, a place and a platform for implementing communication practices.
