Final answer:
The intersection of line EF and line BF is the point where the two lines meet, which is a single point unless the lines are parallel, in which case they do not intersect.
Step-by-step explanation:
The intersection of line EF and line BF refers to the point where these two lines cross or meet. In geometry, when two lines intersect, they share exactly one point in common unless they are coincident lines (lines that lie exactly on top of each other, sharing all points). However, without a diagram or additional context, it's impossible to provide the specific location or properties of this intersection. If these are indeed lines and not line segments or rays, they would continue infinitely in both directions and would eventually intersect at a single point unless they were parallel. In the latter case, they would not intersect at all.