A straight line that intersects either two or more lines is called a transversal line, or simply called as a transversal.
A transversal is a straight line. It intersects two or more lines and they can be either parallel or non-parallel or both types of lines.
Look at the picture. In this example, there are two parallel lines and a non-parallel line but a straight line $\overleftrightarrow{TS}$ passes through all of them by cutting three lines at different points.
The straight line $\overleftrightarrow{TS}$ is called a transversal and also called as a transversal line.
There are two possible cases of forming transversals in geometry. So, it is very important to study them for understanding the properties of the transversal lines.
A line that intersects two or more parallel lines is called transversal of parallel lines.
A line that intersects two or more nonparallel lines is called transversal of non-parallel lines.
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