Bonds
The part of a portfolio built to stay stable
Lending, not owning
A stock makes you a part-owner of a company, sharing in whatever profit or loss follows. A bond makes you a lender: you provide money to a company or government, and in exchange you receive scheduled interest payments. Because you're owed a fixed return rather than a share of the upside, bonds generally offer lower potential gains than stocks — in exchange for meaningfully lower volatility.
Why they tend to hold up when stocks don't
Bond obligations are often backed by the borrower's assets, so lenders are typically prioritized for repayment if things go wrong. Bonds also tend to behave differently from stocks day to day — when investors get nervous about stocks, money often flows toward safer assets like bonds, which is part of why holding some can smooth out a portfolio's worst stretches.
Protecting gains, not just chasing them
It's natural to focus entirely on growth and ignore the downside, but a portfolio with no stabilizing component can be hit hard by a single bad period. Setting aside a modest portion — often a relatively small slice of a portfolio — in bonds isn't about maximizing returns; it's about having something steady to lean on when everything else is moving against you.
Funds over single bonds
The same reasoning behind stock index funds applies here: a bond fund holds many issuers at once instead of depending on any single borrower repaying its debt, spreading out the risk that one of them defaults.