Segmentation is grouping your customers so you can campaign differently to them.

Segments:

• 1: VIP Customers with consistent orders above $10,000
• 2: Regular Customers with an order of at least $5,000 in the past 6 months
• 3: Customers with less than 3 orders

Check out the documentation at https://doc.openerp.com/v7.0/book/2/9_Marketing/#segmenting-your-campaigns

you can refer about it on youtube at https://www.youtube.com/watch?v=dNTJuariNlY