Second Brain / Industry term
Concept tags
Concept tags are short topic labels attached to a record that name what it is about, giving each record a second vocabulary so you can find it later even when your question uses different words than its title.
Concept tags are short topic labels attached to a record that name what it is about, giving each record a second vocabulary so you can find it later even when your question uses different words than its title. Say you save a meeting note titled "Q3 sync" that discusses pricing and a hiring freeze. The title alone will not surface it when you later search for "budget," so you tag the record with pricing, hiring, and budget. Months later a search for any of those words pulls the note up, even though none of them appear in the title. The labels act as deliberate handles you can grab from many angles.
Builder example
Tags can improve filtering when records use the same vocabulary, but they are only one retrieval signal. Full-text search and embeddings may still find a note titled "new-hire week one" when a query says "onboarding." A controlled vocabulary helps facets, counts, and deterministic filters; test whether tags improve recall and precision on real reader questions.
Common confusion: Concept tags label what a record is about so you can find it by topic. Backlinks connect one specific record to another so you can move between them. Tags group many records under a shared theme; a backlink ties two named records together.