Grokking Modern Mobile System Design Interview
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Pagination

Pagination means loading a long list in smaller groups. Each group is called a page. A page can appear as part of one scrolling list. It does not have to be a separate screen.

For example, a post may have 1,000 comments. The app can load 20 comments first. When the user scrolls near the end, it can load the next 20.

This reduces the amount of data the app must download and display at once. The user can start reading without waiting for all 1,000 comments.

The main design question is: How does the app request the next group without repeating or missing comments?

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