Indicates a high-definition resolution of 1280x720 pixels.
Signifies "Dual Audio," meaning the file contains multiple language tracks (often Telugu and a Hindi dub). world4ufree-cfd-rangula-ratnam-720p-dual-mkv
Likely refers to the "release group" or the specific encoder who compressed and uploaded the file. Indicates a high-definition resolution of 1280x720 pixels