Why we need multi-column page layout? Why we do need sidebars? [closed]

1. Why is column layout important?
2. What is multiple column layout?
3. Why do people use 12-column layouts?
4. Can a page have more than two columns?

Why is column layout important?

The column layout plan is very important for a Structure. Because without column layout it's impossible to locate the actual location of the structure.

What is multiple column layout?

Multiple-column layout, usually referred to as multicol, is a specification for laying out content into a set of column boxes much like columns in a newspaper. This guide explains how the specification works with some common use case examples.

Why do people use 12-column layouts?

The number 12 is the most easily divisible among reasonably small numbers; it's possible to have 12, 6, 4, 3, 2 or 1 evenly spaced columns. This gives designers tremendous flexibility over a layout. While the 12-column grid is a popular choice among many designers, it's not a one-size-fits-all solution.

Can a page have more than two columns?

You can format a document into two or more columns in which text and graphics flow automatically from one column to the next. You can change the number of columns for only a few paragraphs of your document, for a whole section, and for text in a text box or shape.