Définition et Signification de "blind spot"

What is the origin of the idiom "blind spot" and when to use it?

The idiom "blind spot" originally referred to an actual area in a person's field of vision that cannot be seen, especially when driving a vehicle. This area is a result of the positioning of side mirrors and can lead to accidents if not accounted for. This expression is now used to refer to a subject or topic that someone finds challenging, uninteresting, or difficult to understand.