TL;DR
A writing style that is right up front: the key points are presented in the first paragraph so readers pick up the most important information quickly. It is well suited to news stories and media releases, but it works well for blog posts, executive summaries in reports and other informative content.
Introducing the inverted pyramid
If you have read a news story recently then you have been exposed to the inverted pyramid, even if you didn’t know it. Hard news stories and other instances of writing using the inverted pyramid intentionally put the most important information first to get the key point across quickly. Subsequent supporting details are included in decreasing order of importance. Think of it like this: the text starts with the details the reader needs to know at the beginning, with following paragraphs presenting details that are nice for them to know.
For content that has newsworthiness or is designed to inform audiences of information quickly the inverted pyramid approach could be the best option. It is a practical and efficient way to convey information, particularly in situations where getting the key details to the audience quickly is crucial. That is why it is used widely in news writing, media releases and other forms of informative content.