Term	Definition	Example
Pull request (PR)	The package of code changes a developer submits for review before it is merged. Most people just say "PR."	"I've been through your PR — the session-management module."
Code review	The process of reading a colleague's code, checking it, and leaving feedback before it is merged.	"'Good work' and 'ready to merge' aren't the same thing — and that's exactly what a code review is for."
LGTM	Short for "looks good to me." An informal approval on a pull request, spoken as individual letters: L-G-T-M.	"Once those two things are in, this is an LGTM from me."
Nit	A minor, non-blocking review comment. A reviewer who writes "Nit:" signals that the author can take the suggestion or leave it.	"This is a nit, not a blocker — but renaming this variable would help readability."
Refactor	To restructure code to make it cleaner without changing what it does. It is a request to improve the structure, not a sign that the logic is wrong.	"This is a refactor, not a rewrite — the logic stays exactly the same."
Edge case	An unusual scenario at the boundary of what the code is designed to handle, which real users will eventually hit.	"I found an edge case — what happens when a user's token expires mid-session?"
Readable / readability	Whether other developers can read the code and understand it easily. Calling code "not very readable" is a technical observation, not a judgment of the developer.	"Think about readability — if someone needs to debug this six months from now, they have to read through all the refresh logic."
Iterate	To improve step by step through repeated cycles. In a code review, it means improving the code across review rounds instead of getting it perfect in one pass.	"We can iterate on the error-handling patterns in a follow-up PR."
Root cause	The underlying reason something went wrong, as opposed to the visible symptom. In a bug, it is the real technical failure behind it.	"The root cause is a missing error state in the refresh handler, not a logic problem."
Follow up	To continue something afterward, usually in writing — a later fix, message, or next step. As a noun, it is the thing you do afterward.	"I'll follow up with both fixes by end of day."

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