let see
if you want to talk about other containers i'm the man for that
AVI - the first container can use lots of codes the best use for it will be "DIVX XVID and the other light codes" know as the first video format to download films and anime from the internet.
RMVB - even that it not to popylar from member how like super Q . RMVB was great things for slow internet anime fans, it is so small ad easy to use for long time most anime site use it for thy anime "RMVB have lots of downside it is good for small file but a big fill for big one" as container it can use only realmedia codes
MPEG, MPG - the VCD DVD code so good but so have not nice for internet use at all but have great Q.
MP4 - light and strong the new internet face it can use the new super code H264 and X264 that make the image so clear and light
MKV - it is pure container, MKV is like a ZIP or RAR file you can add lots of thing in it "VIDEO, sunde more thin one, sub file, chapterfile, flash file, and other things" you can add any of the obve file in it normaly with a mixer and you ill get an MKV
the MKV with RMVB video files and MP3 file in it. the onlt down side to MKV that is not all player can understand it
even DVD player with MKV player in it can play it all the time but it is the srtongest video file for anime .
NOW LET TALK ABOUT THE MONSTER YOU ASK FOR

MOV
MOV ar the strongest video file huge size pure imge and HIGH Q more thin any thing
all other code even H264 have the same idea make the images in secnde less thin 24pic for sic
mpeg make mrphed image in midel of 2 images , DIVX do lots of math for image to knoe the defrent betwen it and the one befor
so you can say if the film need 24image in sec MPG gave you 12 images and divx gave you 4imges
OK know you get it
MOV gave you 24image in second yes no math no morph
24 image in secone for 24 image in seconde
that make MOV totley not good for internet use
BUT
it is the only video good to use for video editors
if you ever work in movie as video editor you will never use other video container
there are others containers but how care