Final answer:
A total solar eclipse occurs when the Moon blocks the Sun, creating a small area of totality and a larger area of partial eclipse.
Step-by-step explanation:
A total solar eclipse occurs when the Moon completely blocks the Sun. The geometry of a total solar eclipse is such that the Moon's darkest shadow intersects the ground at a small point on Earth's surface. This small area, covered by the tip of the Moon's shadow, is where observers will witness a total eclipse.
However, outside this small area, the eclipse will be partial. So, to answer your question, an eclipse does not only have one focus point, it has a small area where the eclipse is total, and a larger area where it is partial.