What is the difference between popover and pop up?
Because popups are often used to serve alerts and ads, most modern browsers include a popup block setting, and some have it activated by default. The average user can't see popup windows. A popover (also known as an overlay, a modal, or interstitial) is part of the actual web page.
Which is the right example for contextual UX?
Contextual UX requires the system to be adaptive to the needs of the user and based on a situational context. A quick example of this is the website 24hoursofhappy.com. The site presents different video content that is generated based on the time and location of user.