stands for High Definition Rip . It's a popular file format used when downloading movies that attempts to balance good video quality with a manageable file size. An HDRip is usually created by taking a high-definition source, such as a Blu-ray disc, a WEB-DL (a direct download from a streaming service), or a high-definition television broadcast, and then ripping (extracting) and compressing it into a smaller file.
I can look up the most convenient available in your region. Planet 51-HDRip--Dual
When searching for Planet 51-HDRip--Dual , you are looking for a specific type of file format: stands for High Definition Rip