It's the part of the page with nothing on it. White space helps your eyes to focus on the text. Use multiple pages instead of trying to squeeze everything onto one. Leave extra space around graphics. There's no justification for justification Use left-aligned text.
Justified text gives strange word spacing that is harder to read.
Most newspapers use justified text because of tradition, not because it is easier to read. When we come to the end of a line, our eyes go back to the left-hand side of the page. If text is ragged on the left, it is harder to read, so always use left justification for paragraphs. When fonts are designed, it is assumed that they will be read in lowercase with no attributes. If you want to highlight a word or brief phrase, use bold , not underline.