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. When a particular user would be clicking on the question in that PAA feature, a drop-down would appear on such featured snippets that are actually called 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 been some instances of infinite PAAs but a lot would stop after several new questions. Such PAA feature first showed in the search results in the summer time of 2015. 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 you must know that this means that ranking such answer to a featured snippet and that PAA question may lead to many cases of exposure. You have to know that one PAA can actually appear in over 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 very important that you actually answer the question in a clear, concise and authoritative way. 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.