\(m\) and \(n\) are any two non-parallel lines and \(l\) is another line intersecting them at \(A\) and \(B\).
Such intersecting line (\(l\)) is called as transversal line.
A transversal line is a line that intersects two lines at distinct points.
The line \(l\) is not a transversal to the lines \(m\) and \(n\), but it is a transversal to the pair of lines \(m\) and \(o\) , \(n\) and \(o\).
Line \(l\) does not intersect the lines \(m\) and \(n\) at distinct points. So, it is not a transversal line.