What is a filibuster? Where, when, and how are filibusters used? How and why did filibuster rules change in 2013? What questions do filibusters raise about the health of American democracy?

What will be an ideal response?

An ideal response will
1, Explain that a filibuster is a tactic by which opponents of a bill in the Senate use their unique right to unlimited debate as a way to prevent or delay the Senate from ever voting on a bill.
2,Explain that like-minded senators working together can practically debate forever, tying up the legislative agenda until the proponents of a bill finally give up their battle. In essence, they literally talk the bill to death.
3, Note that a senator might threaten to filibuster an unrelated measure in order to gain concessions on a bill he or she opposes.
4, Explain that the filibuster rules changes in 2013 in response to Democratic frustration about filibusters of judicial and executive branch nominees. The number of votes required to end debate on those types of nominations has now been reduced from two-thirds of the Senate to a simple majority—except for the Supreme Court, which remains at 60 votes to end debate.
5, Note that at its core, the filibuster raises profound questions about American democracy because it is used by a minority, sometimes a minority of one, to defeat a majority.