576p

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576p is the shorthand name for a video mode. The p stands for progressive scan, i.e. non-interlaced, the 576 for a vertical resolution of 576 lines, usually with a horizontal resolution of 720 or 704 pixels. The frame rate can be given explicitly after the letter

[edit] 576p25

In other words, standard-definition television (SDTV) with a frame rate of 25 hertz. It can be used on analog PAL or SECAM systems (as a 576i signal with both interlaced fields corresponding to a unique frame). PALplus supports it via a "movie" mode signal flag. It can also be transported by both major digital television formats, ATSC and DVB and on DVD.

[edit] 576p50

With doubled temporal resolution, 576p50 is considered enhanced-definition television (EDTV). In some countries, such as Australia, the 576p resolution standard is technically considered High Definition and is thus used by a number of networks for their HD transmission (Channel Seven and SBS TV).

Digital video resolutions

Designation	Usage examples	Definition (lines)	Rate (Hz)
			Interlaced (fields)	Progressive (frames)
Low; MP@LL	LDTV, VCD	240; 288 (SIF)		24, 30; 25
Standard; MP@ML	SDTV, SVCD, DVD, DV	480 (NTSC, PAL-M)	60	24, 30
		576 (PAL, SECAM)	50	25
Enhanced	EDTV	480; 576		60; 50
High; MP@HL	HDTV, HD DVD, Blu-ray Disc, HDV	720		24, 30, 60; 25, 50
		1080	50, 60	24, 30; 25
This table illustrates total horizontal and vertical pixel resolution via box size. It does not accurately reflect the screen shape (aspect ratio) of these formats, which is either 4:3 or 16:9.