Parquet is a file format, not a piece of software. 'apt install csv' doesn't make any sense either.

If you want to shine with snide remarks, you should at least understand the point being made:

    $ apt-cache search csv | wc -l
    225
    $ apt-cache search parquet | wc -l
    0

There is no support for parquet in Debian, by contrast

  apt-cache search csv | wc -l
  259

apt search would return tons of libparquet-java/c/python packages if it was popular.

It's more like "sudo pip install pandas" and then Pandas comes with Parquet support.

Pandas cannot read parquet files itself, it uses 3rd party "engines" for that purpose and those are not available in Debian

Ah yes, that's true though a typical Anaconda installation will have them automatically installed. "sudo pip install pyarrow" or "sudo pip install fastparquet" then.