What is the 'inverted triangle'?

The inverted pyramid is a metaphor used by journalists and other writers to illustrate the placing of the most important information first within a text. It is the most widely preferred method in writing news stories. The format is valued because readers can leave the story at any point and understand it, even if they don't have all the details. It also allows less important information at the end to be more easily removed by editors so the article can fit a fixed size.