A drop is the portion of the tablecloth which falls on all sides of a table and covers its corners.

When the drop goes beyond the knees and touches barely to the floor, that is identified as an important drop. 

A drop is the portion of the tablecloth which falls on all sides of a table and covers its corners.

When the drop goes barely beyond the corners of a table, we refer it to as a top for tablecloth.

When the drop reaches barely or to the knees, that is identified as a minimal drop.