Segment is defined as a group of elements in the affiliate marketing world. This information is crucial to understand the path that the user takes when he accesses the internet to search for products and services. The common elements that constitute a segment are Country, Operating System and Mobile Carrier. For example, if an internet user from UK uses his mobile phone to access the internet, his segment will be defined as UK Android O2. The segment information is useful for affiliate marketers to determine effective campaigns for targeted audience.