| Before you understand what is point of intersection, you must know: 
 What are lines ?
 What are intersecting Lines ?
 
 Definition : Point of Intersection is a point at which intersecting lines intersect each other.
 
 Or in other words:
 
 A common point at which two lines meet each other is known as Point of Intersection.
 
 E.g. In the following diagram:
 
 
   
 Lines P and Q are intersecting lines intersecting at point "O".
 
 Or we can also say that:
 
 Lines P and Q meet each other at a common point i.e. "O"
 
 Hence, Point "O" is referred as Point of Intersection of line P and Q
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