A straight line that intersects a circle at any two points of the circumference of the circle is called a secant of the circle.

A straight line can intersects a circle but it is possibly can intersect the circle at two points of the circumference of the same circle.

The straight line is called as a secant of the circle at the two points.

$P$ and $Q$ are any two points on the circumference of a circle.

$\overleftrightarrow{FG}$ is a straight line and it intersects the circle at two points $P$ and $Q$. So, the straight line $\overleftrightarrow{FG}$ is known as a secant of the circle at points $P$ and $Q$.

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