The plots on this page are **cumulative
distribution functions** (CDFs). A CDF describes a set of
measurements by showing the probability that a measurement will take on
a value less than or equal to *x*. For example, the CDF below
shows that 50% of HTTP 1.1 sites contain 64 objects or fewer:

You can also read it “in reverse”—for example,
30% of HTTP 1.1 sites contain more than 100 objects: