What is Code review?
A code review is a second engineer reading a change before it ships, to catch bugs, share context, and keep the codebase consistent. It is one of the cheapest ways to raise quality, because a fresh pair of eyes sees what the author cannot.
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Why it matters
The author of a change is the worst person to spot its flaws, because they already believe it works. Review catches the bug, the missing edge case, and the surprising decision before users do.
In practice
Good review is fast, specific, and kind: it asks questions, flags real risks, and lets style be handled by tooling. Slow or nitpicky review is worse than none, because it just trains people to route around it.