A stacked pull request (sometimes called a stacked PR, stacked diff, or dependent PR) is a series of PRs that build on top of each other, each one containing a small, logically‑isolated change.

main ──► A ──► B ──► C

│ │ │

│ │ └─ PR‑C (depends on B)

│ └─ PR‑B (depends on A)