One of the keys to combining targeting is to help advertisers reach specific audiences or demographic groups. This article explains how Google Ad Manager handles multiple targeting conditions.
Target criteria from the same targeting dimension
Targeting multiple criteria from the same dimension (such as "Browser" or "Device category") uses "or" logic, allowing you to reach either audience.
Example
You choose to include "Desktop" and "Smartphone" from the "Device category" dimension. Ad Manager then targets visitors using a desktop or a smartphone.
Target criteria from multiple targeting dimensions
Targeting multiple criteria from different dimensions uses "and" logic, allowing you to reach a subset of those audiences.
Example
You choose to include "Desktop" from the "Device category" dimension and also include "Canada" from the "Geography" dimension. Ad Manager then targets visitors using a desktop and from Canada.
Targeting multiple criteria from multiple dimensions uses a combination of "and" and "or" logic, allowing you to reach a subset of those audiences.
Example
You choose to include "Desktop" from the "Device category" dimension and also include "Canada" and "United States" from the "Geography" dimension. Ad Manager then targets visitors using a desktop and from Canada or United States.