Filling out
Padding, refers to the process of adjusting the spacing of words and letters in a block of text so that the right and left sides of the text align evenly with the edges of a given column or space. This is often done to achieve a professional and neat appearance of a printed piece.
Padding creates a formal look
Text padding involves adjusting the space between words and sometimes even the width of letters to make the text fit within the specified column width. This can help make long pieces of text look organized and aesthetically pleasing. Filled-out text is often used in books, magazines, newspapers and other printed materials where a formal look is desired.