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 various PAA results, each time the user clicks an extra PAA question, then such new dynamically loading question is going to appear below. There have also been a few instances of many PAAs but many would stop after some new questions. Such PAA feature first showed in the search results in the summer time of 2015. Know that the organic search feature is actually part of the ongoing efforts of Google for improving the search experience and also keep those searches in the Google interface much longer.
Unlike those featured snippets, the People Also Ask feature now is moving around the first page of those search results. But, the majority of such PAAs showed at the bottom on that first search result page.
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. It is quite important for you to know that the PAA is considered to be one of the quickest growing search result page features and this is a lot faster even to those featured snippets which are known as 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 info that you must know is that one PAA may show up in more than 20 search result pages.
If you try to rank like the answer in People Also Ask question, you have to optimize in the same way like how you would for that featured snippet. It is really essential that you answer the question in that concise, clear, authoritative manner. Having that question or answer to content would give a much better experience for the user by aligning the intent of the user with the relevant content.
It would be great that you go through the website so that you will be able to get more info on the benefits of Google expanding the People Also Ask feature. Through this, you will have more knowledge on how you will be able to benefit from the PAA.