visual-diff

Use color-coding to compare two buffers.

The visual-diff command is like the diff command but uses colors to show differences. It compares the current buffer with the one shown in the next window on the screen, and constructs a new buffer that contains all the lines of the two buffers. Lines from the first buffer that don't appear in the second are displayed with a red background. Lines in the second buffer that don't appear in the first have a yellow background. Lines that are the same in both buffers are colored normally, as are those parts of an added or removed line that are the same in both buffers. With a numeric argument, the command prompts for the name of a buffer to hold the results, instead of using a buffer named #diff#.

More info:

Comparing Two Buffers

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