Check out example codes for "media types in css". It will help you in understanding the concepts better.

Code Example 1

:all 
Suitable for all devices.
:braille
Intended for braille tactile feedback devices.
:embossed
Intended for paged braille printers.
:handheld
Intended for handheld devices (typically small screen, limited bandwidth).
:print
Intended for paged material and for documents viewed on screen in print preview mode. Please consult the section on paged media for information about formatting issues that are specific to paged media.
:projection
Intended for projected presentations, for example projectors. Please consult the section on paged media for information about formatting issues that are specific to paged media.
:screen
Intended primarily for color computer screens.
:speech
Intended for speech synthesizers. Note: CSS2 had a similar media type called 'aural' for this purpose. See the appendix on aural style sheets for details.
:tty
Intended for media using a fixed-pitch character grid (such as teletypes, terminals, or portable devices with limited display capabilities). Authors should not use pixel units with the "tty" media type.
:tv
Intended for television-type devices (low resolution, color, limited-scrollability screens, sound available).
/*Media type names are case-insensitive.*/

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