When composing a page or advertisement, text alignment is crucial. There are several types of alignment: right-aligned, where the text is aligned with the right edge of the paragraph, and left-aligned, where it is aligned with the left edge. Text is considered centered when it is evenly distributed on either side of the central horizontal axis of the page or column. Finally, it is described as justified when the spaces between words are adjusted proportionally, creating a block of text that extends from left to right to form straight vertical edges. The origin of this terminology dates back to the time when printing type was done manually using lead type aligned on a metal iron bar.