Feature branch workflow is a popular Git strategy that involves creating separate branches for each new feature, bugfix, or refactor, allowing developers to work in isolation and merge changes back into the mainline once they are ready. This method ensures a stable main branch, enables parallel development, integrates with pull requests, reviews, and CI pipelines, and supports code review processes. However, it can lead to challenges like merge conflicts if branches are left open for too long, and it may slow down integration compared to trunk-based development. While feature branches are beneficial for maintaining isolation and clear review checkpoints, modern automation tools like merge queues can mitigate issues by keeping branches updated and managing merges efficiently, blending the benefits of feature branching with the speed of trunk-based approaches.