Politics and Democracy
The World Health Organisation describes civil society in the following way:
It is generally considered to be a space between the government and govenrment agencies and businesses and corporations in the private sector.
Civil society has grown significantly since the end of World War II, and it plays a critical role in any healthy democracy because of the way in which it can enable citizens who are underrepresented to have a voice and make an impact on society, and it enables issues to be highlighted that have not been prioritised by the political system.
For more information into what civil society substantively involves, this page by the World Economic Forum gives some useful insight.