发布 (fā bù) means 'to release, issue, or announce' — used for news, statements, products, etc., often by an official body or company. It overlaps with 发表 (publish an article/opinion) and 公布 (make public, e.g. results), but 发布 is broader and more common for official announcements and product launches. 发行 (fā xíng) is for publishing books/films or issuing currency/stocks, while 推出 (tuī chū) focuses on launching a new product to market.