RowLines

is an option for the low-level function GridBox that specifies whether lines should be drawn between adjacent rows.

Details

The default setting is RowLines->False.
RowLines->{v₁₂,v₂₃,…} specifies whether lines should be drawn between successive pairs of rows. The v_ij can be True or False.
If there are more rows than entries in the list, the last element is used repeatedly for remaining pairs of rows.
Lines can be drawn around the outside of a GridBox using FrameBox.

Use lines between each row and the next:

Wolfram Language code: GridBox[{{"a", "A"}, {"b", "B"}, {"c", "C"}}, RowLines -> True]//DisplayForm

Use a line between the first and second rows but not between the second and third rows:

Wolfram Language code: GridBox[{{"a", "A"}, {"b", "B"}, {"c", "C"}}, RowLines -> {True, False}]//DisplayForm

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