A The top-level structure of your account, think of campaigns as folders within your account. You can create one or more campaigns inside your account based on your advertising objectives. There are multiple ways to structure your campaigns, for example, you can use campaigns for different targeting (search vs. display), for structuring keywords, allocating budget and more. Each campaign contains one or more ad groups to create a more granular structure inside your account. See also ad group.... Always-R Glossary spending limit allows you to set a maximum amount of money to be spent on a campaign. Your campaign stops running when it reaches your campaign spending limit.