Convert PDF to PNG

Once upon a time I had to convert multiple pages pdf file to png images using command line (terminal) in Linux(Ubuntu, Linux Mint, etc).

Googling brought me to a variety of different answers, but none of them was as simple as reading pdftoppm tool's man page.

Pdftoppm converts Portable Document Format (PDF) files to color image  files  in  Portable
       Pixmap (PPM) format, grayscale image files in Portable Graymap (PGM) format, or monochrome
       image files in Portable Bitmap (PBM) format.

       Pdftoppm reads the PDF file, PDF-file, and writes one PPM file for  each  page,  PPM-root-
       number.ppm, where number is the page number.

So take it as is in a single command: pdftoppm -png inputFileName.pdf outputFilesNames