Built for quick review, not replacing reading
This pulls out the sentences most connected to your material's frequently-repeated ideas (the same extractive technique used by this site's other summarizer tools) and separately lists the terms that come up most often - useful as a quick-review sheet before a test, or to decide which parts of a long reading actually need your full attention.
This selects existing sentences and counts word frequency - it does not understand the material or verify accuracy. It is a study aid for material you have already read, not a substitute for reading it.
Why it lists frequent terms separately from the key-point bullets
The bullets and the term list answer two different study questions: the bullets give you sentences worth re-reading, while the term list gives you a quick glance at the vocabulary that dominates the passage - useful on its own for flashcard-style review, even before you've worked through the bulleted sentences in detail.
Why a longer passage produces a more useful summary
Word-frequency scoring needs repetition to work - a term or idea has to appear more than once for the tool to recognize it as central. A short passage rarely repeats anything enough times to separate signal from noise, which is why this tool requires a longer minimum passage and tends to perform noticeably better on full pages of notes than on a few isolated sentences.
Why this uses the same technique as this site's other summarizers
Extractive summarization - scoring and selecting existing sentences rather than generating new text - produces a result you can trust to be grounded in what was actually written, with no risk of a generated sentence subtly misrepresenting the source material. The same reliability reasoning applies whether the use case is a quick article summary or exam review.