: A general term for a lighter-than-air craft (like a balloon or blimp) that gains buoyancy through gas.

: Refers to the Parseval-Luftschiff (PL) series of airships built by the German firm Luft-Fahrzeug-Gesellschaft starting in 1909.

Be cautious of websites offering a "full feature" download of this specific name, as they are often deceptive and may host malicious software. If you are looking for specific information on historical Parseval airships or technical data on modern tethered aerostats , it is safer to use academic or governmental resources. I can not extract RAR file - Ask Ubuntu

: A common compressed file format used to bundle multiple files into one archive for easier distribution.