Definition and meaning of think tank: A think tank is an institution that researches and provides policy advice on political and social issues, with the goal of influencing public opinion and policy decisions. Think tanks are generally independent of government and corporate interests, and bring together experts from a variety of disciplines to develop solutions to complex challenges. Some think tanks are ideologically based, while others are nonpartisan and independent.
For example, the Democracy Fund, a nonpartisan organization, works to increase public participation in the political process and strengthen democratic institutions. Similarly, the Center for American Progress promotes progressive policies and seeks to bridge the gap between the government and the public.