Benchmark
The index a fund is measured against, like the S&P 500.
Where it is explained in full
Funds: what you actually own when you buy one. Both kinds are baskets. The differences are in how you buy them, how they are priced, how they handle taxes, and what it costs to hold them for decades.
A definition says what a thing is; it never says whether it fits you. The guides explain how it works and name the professional who confirms it for a particular person. The No Advice Disclosure.
Ask about Benchmark
A model reads this page and answers from it. It will say when the answer is not on the page. Education, not personalized advice.