Why is the $x$ axis for a histogram labeled "bin"?

When talking about histograms, why do we refer to the x-axis as "bin"?

• In vernacular English, a "bin" is a container for holding things. On the horizontal axis, we have a number bins, each of which holds data points that are sufficiently similar. We are essentially sorting the data into box.
– Xander Henderson
Apr 12 '18 at 16:51