Continuous website optimization, or SEO, is a technique used to raise a website’s position in natural, unpaid search engine results (SERPs).
Google’s algorithm incorporates more than 200 ranking factors. The four basic subcategories of SEO are technical SEO, user interaction signals, off-page SEO, and on-page SEO.
Keep in mind that SEO is a subset of the general term SEM. Therefore, what I just said about SEO also applies to SEM. But SEM also involves PPC in addition to SEO. Additionally, the PPC industry has its own set of features, best practices, and other things.
Bidding is the key to paid search ads, whether you use Google Ads or Bing Ads. In PPC, you place a bid for a particular keyword.