Why does a web server need to know the address, browser type, and cookies for a requesting client?

What will be an ideal response?

Address:
To
send
back
requested
pages/files.
Type:
Different
browsers
render
differently
and
support
different
functions,
so
they
may
require
different
versions
of
files.
Cookies:
Web
servers
use
cookies
to
track
session
and
user
information;
without
a
cookie,
the
server
can't
know
the
context
of
the
request.