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When you check a file in, the source-code control system changes the status of the file from writeable to read-only, and records that you have checked in the file. It also records the differences between the contents of the file when you checked it out and when you checked it in.
You generally want to view the changes to the file before you check it in to confirm the changes that you made. In some cases, you may want to discard all changes to your file before checking it in. In other cases, you may need to merge changes that coworkers have made to the file after you checked it out. If you had the file checked out exclusively, after you check it in, others can check out the file.
Check files in and merge changes