Seo is basically a part of SEM
Difference between SEM And SEO: Search Engine Marketing

SEM(Paid Search Engine Marketing is also known As PPC)
Search Engine Marketing is the Online Marketing to promote your business, brands,
and products on search engines utilizing digital resources.
SEM is a paid digital marketing model, where advertisers pay to search engines to display their ads on search engines result page with the help of Advertising platforms.

Example of search Engine Marketing Platforms: Google Ads are formerly known as Google AdWords Microsoft Advertising formerly known as bing ads and Yahoo marketing Platform

Types of Paid Search Advertising and PPC
Paid Search Marketing
Display Advertising
Retargeting PPC Advertising
Social Media.

I hope you enjoyed reading this article.
Keep In touch To learn Latest Pay Per Clicks Tactics & Trends!