PPC stands for pay-per-click advertising. Pay-per-click is a pricing model for the online marketing where an advertiser pays each time its ad is clicked on.The best known platform for pay-per-click Ads are Google Ads (formerly known as Google AdWords). Some of the other platforms include Microsoft Advertising (formerly known as Bing Ads), Facebook Ads, Outbrain and Taboola. To know more about Pay-per-click Advertising, please click on the prescribed link
In the world of SEO, Crawling means “following the web link” of your website.
Whereas, the indexing is the process of “adding the webpages into the Google Search”.
To know about the difference please click on the prescribed link https://www.amritsariablogs.com/post/difference-b-w-crawling-and-indexing-in-search-engine-optimization-i-e-seo
