There are many data storage formats of videos or movies , for example

DVDRip , BDRip/BRRip , BluRay , CAM , HDTS , HDDVDRip , HDTV/PDTV , WEB-DL , WEBRip , HR HDTV , TVRip etc . are the data storage formats.

1. DVDRip :- In DVDRip,the movies are extracted or rendered directly from DVDs and converted to other formats like AVI,RMVB,etc.the menus and the additional information are removed from the video to consume less disk space.
2. BDRip/BRRip : - (BluRay Disk Rip)In this format the movies are extracted or ripped directly from the BLURAYs Discs and converted to other formats AVI,RMVB and other.
3. BluRay : - In BluRay format the video is extracted and encoded from the BluRay disc.This format is compatible with common video players which eliminate the need for BluRay players.
4. CAM : - CAM is the worst movie rip,usually recorded by a digital camera or even with the mobile phone in theaters.
5. HDTS : - It is a TS version only in better resolution.But overall,the quality is still low.
6. HD DVDRip : - A copy of the final HD DVD release.The quality is much higher than a DVDRip.
7. HDTV/PDTV : - PDTVs are captured from a TV with a PCI DIGITAL card,usually generating the best result.
8. WEB-DL : - This is a movie or TV show downloaded via an on-line distribution websites (web download),such as iTunes . The quality is quite good since they are not re-encoded.
9. WEBRip : - It is a rip made from a Movie Stream from an online source , through its own programs so it doesnot lose the quality transmitted from the websites.
10. HR HDTV : - This format usually has a high resolution of 960*528 or 960*544 . HR HDTV video of 40 to 50 minutes has an average size of 700 MB,it come with the original AC3 5.1 sound is maintained.
11. TVRip : - TV episode that is either from Network (capped using digital cable/satellite boxes are preferable).The quality is much lower than HDTV.

BluRay formats might be the best to download videos or movies from the internet.