In MS Word line and page breaks give you more control over how text flows. When using Word column breaks are also useful.
Breaks allow you to have more control over the layout of your document. You might use a page break if you're writing a paper that has a bibliography to ensure the bibliography starts on a new page. You might use a column break if you are using columns and want them to be arranged in a particular way.
Optional: You can download this example for extra practice.
Breaks are hidden by default. If you want to delete a break, you'll probably want Word to show the breaks so you can find them for editing.