Since its inception some years back, there has been significant rise noticed in the use of PA systems for all purposes. Such systems are very vital when addressing a large number audience at one place. The rise in use of such system is very large and more use of it for many other purposes is expected in the near future.
The PA system is basically an electronic sound amplification that consists of a microphone, and amplifier and a loudspeaker. There are many outlets of loudspeakers and if needed they can be attached to many other speakers and address a large places with many people in it.
The use of such system is very vital and since the inception of wireless microphone, the affectivity of PA systems has been highly increased.
It is widely used for announcements at railway stations, sports stadiums and other public speaking podiums as well.
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Source: http://portable-sound-system.blogspot.com/2016/02/has-public-announcement-systems-made.html