15 refers to the video quality, I assume. In that case, I'd say the DVD-Rip quality of "Malligadu" is decent, with a clear and stable video stream. The 15 likely refers to a 1.5MB/s or 15Mbps bitrate which is fairly standard for a DVD-Rip.
"malligadu telugu movie dvdrip 15 better" appears to be a highly specific file-naming string or a search query used to find high-quality digital copies (DVDRips) of the 2012 Telugu movie 1. The Movie: Original Version: malligadu telugu movie dvdrip 15 better
Before diving into the piracy issue, let’s appreciate the film itself. Malligadu (roughly translated as "The Son-in-Law" or referring to a protagonist named Malli) revolves around a carefree, street-smart young man who inadvertently gets entangled in a web of local gang wars, family honor, and romance. 15 refers to the video quality, I assume