What is Google Ads?
Google Ads (formerly known as Google AdWords) is a type of online advertising developed by Google. Advertisers bid to display ads placed up top in the results of search engines like Google Search, on websites, in apps, and videos. The ads are shown to users who search for the keywords the advertiser has bid on. That way the ads only show up to people with an intent to purchase exactly what you’re advertising for. Google Ads uses a PPC (pay-per-click) pricing model. It’s a surefire way to build awareness and drive traffic to your website.

How it works
People who use search engines are actively looking for something specific. That’s what we call intent to purchase. What they type into a search engine when they’re looking for a product are the keywords you bid on. You choose a list of keywords that are relevant to what you offer, write your ad, set a budget, and let Google Ads do the rest.

More info - https://ads.google.com