What is the difference between organic SEO and pay-per-click search?

What is the difference between organic SEO and pay-per-click search?

Answer-

Organic SEO is content optimized to direct traffic organically when people search for the topic.

pay-per-click is when you choose specific keywords in your ad, in order to get the ad placed on the search results page where google has reserved spots for ad placement. When someone searches for your keywords and related topics, your ad is shown

How much the ad costs depends on the keyword & competition that has chosen the same keyword to place their ad with and how much they're willing to pay for it