This is a standard abbreviation for "Season 01". It clearly specifies that the file contains the first season of the series.
Please note that the availability and legality of BollyModTop Mohrey S01 Hindi 480p WebDL ESU Portable may vary depending on your location and local laws. Always ensure that you are using the application in compliance with applicable laws and regulations.
: The audio track language of the file. This ensures the viewer downloads the original or dubbed Hindi version rather than a regional alternative like Tamil or Telugu.