Theory:

In your daily life, you might have seen the street lamp, the electrical junction, and a tremendously constructed building. If you take a closer look, you might have seen a transversal lines in these constructions.
Example:
1. The electrical junction makes a transversal line.
 
App1.jpg
 
2. The shadow of the street light makes the transversal line.
 
App2.jpg
 
3. A well-constructed building's design.
 
Building.jpg
Transversal is a line, which intersects two or more lines in different points.
Transversal.png
 
Here, \(m\) 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 a transversal line because the line \(l\) 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 \(o\).
 
Now, let us see some more lines. Observe the below two figures.
 
How do these images differ from the above figure?
 
trans_1.png
 
Trans_2.png
 
The above figures are not a transversal line. Because the line \(l\) does not intersect the lines \(m\) and \(n\) at distinct points. So, it is not a transversal line.