Likes and reactions are the simplest form of engagement on social and video platforms — single-tap signals that indicate a viewer enjoyed or found value in a piece of content. On YouTube, likes are one of the most direct algorithm signals: a strong like-to-view ratio tells the platform that content resonates with its audience, which can improve ranking, distribution, and placement in Suggested feeds. Likes also contribute to social proof — new viewers use the like count as a quick credibility indicator before deciding whether to watch or continue watching. Managing your engagement rate means keeping likes proportional to your views for a natural-looking profile.