Both use an underline as visual affordance, but they behave differently and serve different purposes.
Choose based on what happens when selected
It takes them somewhere new — a new page, external site, anchor point, or browser tab → use a text link
It performs an action on the current page — expands content, triggers a change, submits something → use a link button
- Browsers and assistive technologies treat them differently: text links can be opened in a new tab, bookmarked, or copied as a URL. Link buttons can't. Using the wrong one creates unexpected behavior for keyboard and screen reader users.
- Quick check: Does selecting it change the URL? Yes → text link. No → link button.