Concept tags

  • Industry term
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Concept tags are short topic labels added to a note or record, so a later search can gather the material on one subject.

Most notes apps already search every word inside a note, yet a note's text often never names its subject. A tag supplies that word, picked by the person who knew what the note was for when it was saved.

Where you’ll meet it

You keep household paperwork in a shared notes app, and over the years receipts have been tagged tax, taxes, IRS, and 2025-taxes. Preparing this year's return, you search for "taxes" and get about half the receipts you know are in there.

What to do

  1. Ask the notes app's assistant to list every tag in use and group the near-duplicates.
  2. Pick one tag for each group and have the assistant retag every note to it.
  3. Pin a note listing the chosen tags, and tag new receipts only from it.

Easy to mix up

How many notes does it connect?
Concept tagsBacklink
Any number, all carrying the same labelTwo, because one note links to the other

Check yourself

An assistant gives every note it saves a dozen tags, taken from whatever words appear in it. A month later, what will searching by tag likely show?

Go deeperLibrarians fix tag drift with an agreed list of terms

In a library catalog's “controlled vocabulary,” each variant, such as IRS, points to one preferred heading. Tags that people invent freely, as on early bookmark- and photo-sharing sites, came to be called a “folksonomy.” A fixed list stays consistent until a new topic arrives that nobody has added. Free tags keep up with new topics and drift into near-duplicates.

Search that matches by meaning, using embeddings (lists of numbers that place similar ideas near each other), can find a note that has no tags. Tags still give what it can't, an exact filter such as every receipt tagged medical, with the same count every time. Many tools combine the two, filtering by tag and then ranking by meaning.

Practice Second Brain

Or take the learning quiz on a mix of every set