In practice, a press kit is indispensable when a press release does not suffice. It provides all the necessary information concerning the event it announces and, at the same time, serves to situate this information in the general context of the company or the project, by presenting the main contributors, etc. It is absolutely necessary in any meeting with the media.
Generally, it consists of about 10 pages—more or less depending on your needs—and it will be written in such a way as to facilitate the work of those it primarily targets: journalists.
Before its redaction, a discussion will be necessary in order to determine its angle and get acquainted with your company so as to better transcribe its identity on paper.