That's how far the center of the Earth is straight down under your feet. It's farther than the distance all the way across the USA, from New York to Los Angeles. It's like the distance from London (England) to Chicago.
If you drill absolutely straight and aim straight down, that's how far you need to drill to reach the center. Unfortunately, your drill will melt long before you get there.
The longest hole ever drilled into the Earth (so far) is the Sakhalin-I Oduptu Well, drilled by Russia into the sea-bottom in 2011.
That hole is 40,502 feet ... roughly 7.67 miles, or about 0.0019 of the distance to the center of the Earth. You can see that we still have quite a long way to go !
