Dofollow Link
A standard link that passes ranking signals (link equity) to the target page.
A dofollow link is an ordinary link with no rel attribute restricting it. It passes link equity (sometimes called "link juice") to the destination, helping it rank. Most editorial links you want to earn are dofollow.
A common, silent problem is a dofollow link being switched to nofollow after publication — which is exactly the kind of change backlink monitoring is designed to catch.