vcd and SVCD is correct, but dvd isn't. dvd is also mpeg2. it just dvd uses resolution 720x480 for NTSC and SVCD uses 480x480.
both are mpeg2, SVCD just have some limitation but quality is at least 2 times better than VCD.
comparing size mpeg4 and mpeg1, for example both at 100MB, the picture/video quality of mpeg4 will look better if done properly.
Have a dig around the glossary section here - it'll fill in most of the gaps quite nicely.
In many cases a variety of compression formats can be recorded to CD and or DVD - it's more a matter of capacity versus quality and what you want to play it on.
