A caucus is simply a meeting of like-minded people who gather to discuss a particular issue and to reach a decision on it. In politics, caucuses are very important; in legislative bodies, members of the same party frequently caucus together to create strong legislation which the whole party can support, for example. A caucus may also meet to make decisions about party policy; in the corporate world, caucuses also meet to determine corporate policy and decisions.

The origins of the word are a topic of dispute. The first known appearance of “caucus” in reference to a gathering is from 1763, when the Caucus Club met in Boston. Some etymologists believe that the word comes from the Medieval Latin caucus, which means “drinking vessel,” in a reference to the beverages which undoubtedly accompanied meetings of the Caucus Club. Others think that it is derived from an Algonquin word which means “counselor,” as some Native Americans engaged in a decision making process similar to that of the modern caucus.

For Americans, the word “caucus” usually conjures up an image of the Iowa Caucus, an extremely complex political event which plays a major role in Presidential elections. The Iowa Caucus is actually a holdout from an older political system in the United States; in the early years of American independence, congressional representatives met in caucuses to decide the party nominations for President, bypassing the voters altogether. When individual voters were allowed a say in the process, several states created a caucus process, rather than asking voters to simply vote on ballots.

The process involved in the Iowa Caucus can be quite confusing. Essentially, in early January, Iowans travel to thousands of caucus locations which are scattered throughout the state and broken up by party. The attendants of the caucus vote for delegates representing particular candidates who will be sent to county conventions. At the county conventions, delegates are selected for the state convention, at which point Iowa's preference for the Presidential nominations will be determined. Delegates are sent from this convention to the National Party Conventions, where Democrats and Republicans decide on their nomination for President.

At the caucus, voters meet and discuss the candidates before casting their votes, making the caucus an interactive voting process. Democrats vote by raising their hands or moving to various areas of a room dedicated to specific candidates. After this initial vote, the caucus coordinator decides which candidates are viable, inviting people who voted for nonviable candidates to vote again. For example, in a caucus where voters are asked to decide between candidates A, B, and C, there might be only a handful of voters supporting candidate B, meaning that he or she does not merit a delegate. When asked to vote again, these voters can support candidates A or C, ensuring that they get a say in the nomination. The number of delegates is based on the number of people in the area represented by the caucus.

Republicans have a simpler caucus system in Iowa; they simply cast secret ballots which are tallied, and delegates are sent on the basis of how m any votes each candidate received. Both Democratic and Republican delegates are expected to represent their candidates at the various conventions they attend, expressing the interests of their individuals caucuses.