Extract from Wikipedia:
The Overton window, in political theory, describes a "window" in the range of public reactions to ideas in public discourse, in a spectrum of all possible options on a particular issue. It is named after its originator, Joseph P. Overton[1], former vice president of the Mackinac Center for Public Policy.
At any given moment, the “window” includes a range of policies considered to be politically acceptable in the current climate of public opinion, which a politician can recommend without being considered too “extreme” or outside the mainstream to gain or keep public office. Overton arranged the spectrum on a vertical axis of “more free” and “less free” in regards to government intervention. When the window moves or expands, ideas can accordingly become more or less politically acceptable. The degrees of acceptance[3] of public ideas can be described roughly as:
- Unthinkable
- Radical
- Acceptable
- Sensible
- Popular
- Policy
The Overton Window is a means of visualizing which ideas define that range of acceptance by where they fall in it. Proponents of policies outside the window seek to persuade or educate the public so that the window either “moves” or expands to encompass them. Opponents of current policies, or similar ones currently within the window, likewise seek to convince people that these should be considered unacceptable.
Other formulations of the process created after Overton's death add the concept of moving the window, such as deliberately promoting ideas even less acceptable than the previous "outer fringe" ideas, with the intention of making the current fringe ideas acceptable by comparison.
