Some kernel modules have parameters, a.k.a. options to modify their
behavior. For example, a kernel module that implements a device driver for
a sound card may have a
port and an
irq parameters which
are necessary for the driver to work. Or a webcam may have several parameters
that control the sensor.
The /sbin/modinfo command shows the list of parameters a module
supports, and brief descriptions for each parameter.
See The Linux
Documentation Project's documentation for details on Linux kernel modules.