Because its search engine is Google's bread and butter, Search ads are the bread and butter of Google's advertising program. They've come a long way since I was a fledgling AdWords (now Google Ads)
Display ads
Do you ever feel like someone's watching you—and repeatedly showing you ads for something you Googled yesterday?
Shopping ads
Unlike Search ads, which advertisers fill out from scratch with original copy, Shopping ads pull data from product feeds in the Google Merchant Center. Sellers with physical inventory can use these auto-populated ads to convert sales in:
Video ads
Before, during, and after videos on YouTube; in YouTube search feeds; on the YouTube home feed; and across the Google video partners network.