Glimpsing is where you pick up your phone and glance at it but don’t do anything further. For example, checking the time on your phone or looking at a notification telling you that you've got a new message. It’s about micro-moments.
Then there’s snacking, which is where you pick up your device and just scroll through something quickly, like reading a message. This gives you an idea of what something is about in a few seconds, but you don’t click on the link or read it in detail. You may decide to save a link though or read it later.
Chunking is where you actually carve out time to take in information, like clicking on the link, reading a long-form article or looking at a dashboard.
The last one is immersion, which involves actually responding to what you’ve seen. You become fully immersed in the task like writing a long-form story or doing some analysis.