We all work on multiple windows at once. You need information from the web to write something in a document or fill in a spreadsheet. Or you have to read a PDF of a report while you compose an email introducing it to your team.
You can easily size windows on your Mac by clicking and dragging the edge. But you might still end up with multiple windows floating around. When you go to your Word doc, your spreadsheet disappears. Then your browser window covers your email.
Split-screen view is a simple and elegant solution to the floating windows problem. Split view neatly positions two windows to fill your entire screen. Your other 296 windows disappear, temporarily. Think of it as a dual focus mode.
Read more at BusinessInsider.com