Question

what is the use of page down arrow key​

Answer 1

Answer:

The human eye is capable of detecting a single photon, the smallest unit of light, according to a new study. Your eyes may be more sensitive than you ever thought possible.19-Jul-2016

Answer 2

$\huge\underline\frak\pink{ansWer:-}$

The Page Up and Page Down keys (sometimes abbreviated as PgUp and PgDn) are two keys commonly found on computer keyboards. The two keys are primarily used to scroll up or down in documents, but the scrolling distance varies between different applications.