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This question already has an answer here:

In what cases should pop up and modal should be used? What are the best and worst case scenario of using pop up and modal?

In mobile/ipad version which option is most suitable option & why?

Which websites do you use pop & modal? (for ex: Facebook, Trello, amazon etc.)

marked as duplicate by Mayo, Devin, locationunknown, Benny Skogberg Feb 26 '17 at 18:41

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  • I'm pretty clear on what modal windows are, but not so much about popups. Could you define that? – Ken Mohnkern Feb 24 '17 at 13:48
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Use when

  • you want to allow users to maintain the context of their task.
  • the user needs to know/do something important before they carry out their task.
  • you require acknowledgement and the cost of an error could be very high.
  • you want your user to focus on a single piece of content, be it an image, article, or a video.
  • you want to interrupt a user’s current task to catch the user’s full attention to something more important.

Do not use when

  • you want to show error, success, or warning messages
  • the content is too much that will require scrolling.
  • it includes multiple steps - such as wizard.
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What's the difference?

For those who don't know, popup is normally a child window opened by a webpage that blocks any interaction with the parent window (until the popup is closed). A modal is not a window, but rather an HTML construct that would give an impression of the window, and would block any interaction with the rest of the page.

Here's how a bootstrap modal looks like: enter image description here Source: http://v4-alpha.getbootstrap.com/components/modal/

Which one to choose?

You should most certainly choose modal over popup window in any realistic requirement.

Popups have a tendency to get annoying to users, especially because they would often prevent users from going back to the previous page or even navigating to other pages (depending on the way the web developer has configured them). Modals on the other hand are the way to go for better animations, ease of use and less annoyance.

Another problem with use of popup stems from the popup blocker configurations. If a user has blocked popups on your website once, chances are you will never realize that, and they would think that your site is not working. Modals can not be disabled, and thus give you complete control of how users see your site.

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