Описание тега self-extracting
A self-extracting archive is an archive that doesn't require any special application to extract its contents.
Unlike "normal" archives, which need a special application to be packed, unpacked or modified, a self-extracting archive is an application that contains both the archived data, and the logic to extract it.
The biggest advantage of this approach is the lack of need to download additional software to unpack the data.
However, such archives may be a security threat, because the user can't really know what is inside of it until he runs the application, which may potentially contain dangerous code.