Ad groups are a hierarchy for managing

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campaign
A campaign is a way to group together products and services by purpose or product type. You can set the daily budget, which device to deliver to, the target region, bidding rules, delivery schedule, etc. In addition to roughly determining the delivery canadian cfo email lists rules and schedule, you can also manage targeting settings here.

Ad Group
ads and keywords as a set. You can put multiple keywords and ads in them, but you can also put one keyword and ad in one ad group and manage them. Here you can set the bid unit, negative keywords, ad copy, targeting, etc. in detail.

keyword
You set which keywords users search for and whether or not you want to advertise with them. This is the most important part of listing ads. Predict and analyze what keywords users are searching for to use your company's products or services, and set them. We will explain how to set keywords later, so please refer to that as well.