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5–16 Learning More About Your Computer
Understanding Computer Terms
ISP (Internet Service Provider)
A company that provides access to the Internet. To use the service,
you need the ISP software, a user name, a password, and access
phone number(s).
J
jewel case
The hinged plastic case in which CDs are often stored.
jewel case sleeve
The pieces of paper that can be inserted into the jewel case to help
identify the contents of the CD stored in the case.
joystick
A lever that moves in all directions to control the movement of a
pointer or objects on the screen. It is used for computer games in
which you drive, fly, or shoot objects displayed on the monitor.
JPEG
(pronounced “jaypeg”). A file format for graphics, especially
photographs, displayed on the Internet. It is easily identified by the
file extension .jpg. JPEG files, which store more information per pixel
than GIF files, are used for complex, high-resolution images. See
GIF. See also pixel.
L
lead-in
An area at the beginning of each session on a recordable session that
is left blank for the session’s table of contents. The lead-in is written
when a session is closed, and takes up 4500 sectors, approximately
one minute, on a CD. The lead-in also contains the next writable
address on the CD so that future sessions can be added, unless the CD
is closed.