Such PAA or People Also Ask feature is one series of dynamically loading questions which are related to the first searched query showing in those search results on the mobile and desktop. If a user would click on a certain question in such PAA feature, such drop-down would appear with those featured snippets known as the quick answers from a different search result.
For a lot of the PAA results, every time a user would click an additional PAA question, then the new dynamically loading question would be shown below. There have also been a few instances of many PAAs but many would stop after some new questions. It was in the summer of 2015 that such PAA feature was initially shown. Be aware that the organic search feature is essentially a part of the ongoing efforts of Google to be able to improve such search experience as well as to keep the searches in such Google interface much longer.
Unlike those featured snippets, the People Also Ask feature now is moving around the first page of those search results. However, a lot of the PAAs showed below on the first SERP.
What you must know is that the People Also Ask feature has really grown in popularity at the time that Google first debuted this in 2015. You should learn that the PAA is actually one of the fastest growing search result page features and is also much faster even those featured snippets also called the quick answers.
What you should know is that such PAAs actually show in 70 percent of the search results that show snippet and this seems to be using the same source for answering the featured snippets and the different PAA questions. What this truly means is that ranking the answer to such featured snippet as well as PAA question may result in various instances of exposure. An important info to know is that PAA can actually show up in over 20 search result pages.
When you would try ranking like the answer in the People Also Ask question, then you must optimize similar to how you would for such featured snippet. It is really essential that you answer the question in that concise, clear, authoritative manner. Taking such question or answer approach to content provides a lot better user experience through aligning to the user intent with the pertinent content.
It would be a fantastic thing that you really checkout the website for you to have more info on the advantages of such Google expanding the People Also Ask feature. In doing so, you will be able to learn more on the advantages of using the PAA.