I am answering based on the most likely intent: that you are looking for information on these types of archive files. Understanding .RAR Files
The original software for .rar files. It has a "free trial" that technically never expires. Download S05 rar
A full season of a TV show should be several gigabytes (GB). If the "S05.rar" file is only a few megabytes (MB), it is likely a fake file or a script designed to infect your computer. I am answering based on the most likely
The phrase is a common search term used to find compressed files (using the .rar format) that typically contain the fifth season of a television series or specific software packages . A full season of a TV show should be several gigabytes (GB)
Always run an antivirus scan on the .rar file before you extract it.
It may refer to a specific Version 5 update or a "S05" expansion pack for a software application or video game.