消息来源（英语：web feed、news feed、syndicated feed又译为源料、馈送、信息提供、供稿、摘要、源、新闻订阅、网源）是一种数据格式，网站可透过它将最新信息传播给用户，用户能够订阅网站的先决条件是网站可提供持续更新的信息。消息来源受到网志及新闻网站的广泛采用，因为此类型的网站经常更新内容。如前所述，feed的译名很多，莫衷一是，至2008年底为止，还没有一个十分通用而备受认可的中文译名。将feed汇流于一处称为聚合（aggregation），而用于聚合的软件称为聚合器（aggregator）。对最终用户而言，聚合器是专门用来订阅网站的软件，一般亦称为RSS阅读器、feed阅读器、新闻阅读器等。

On the World Wide Web, a web feed (or news feed) is a data format used for providing users with frequently updated content. Content distributors syndicate a web feed, thereby allowing users to subscribe to it. Making a collection of web feeds accessible in one spot is known as aggregation, which is performed by a news aggregator. A web feed is also sometimes referred to as a syndicated feed.