Hi, it means that you will have to pay for each click that a person will make. For example, if I make a click on your site you will have to pay for it. Hope that now is clear
Another way to describe it is... Let's say you want to buy traffic from me. Traffic meaning visitors coming to your website or page. If I send you 100 visitors to your website, I just sent you 100 clicks. To get those clicks you have to pay a set price per visitor. That is pay per click advertising.
PPC stands for pay-per-click, a model of internet marketing in which advertisers pay a fee each time one of their ads is clicked. Essentially, it's a way of buying visits to your site, rather than attempting to “earn” those visits organically.
Yes, I think everyone must know that PPC stands for pay per click. See let us assume that I have a site and I want it to be on the top of the SERPs but I do not want to do organic SEO then I will go for Paid SEO in which PPC will help me out to be ontop of the ranking.