What are Horizontal and Vertical applications in Siebel CRM

Siebel Applications are categorized as two types.
1. Horizontal Applications
2. Vertical Applications

1. Horizontal Applications: Different types of Customer, Partner or Employee and channel                                                                applications.
2. Vertical Applications:   Different types of Industries application.
                                         Vertical applications are also called as Industry applications.

Example:
Horizontal Applications:
* Siebel Sales
* Siebel Call Center
* Siebel Partner Portal

Vertical Applications:
* Siebel Finance
* Siebel Consumer Goods.