Customers are the people who generate support requests from any of the available support channels. 

Customers are added in zaidesk through these following platforms:

1. By submitting ticket through email
2. By signing up from support portal (when web portal is enabled)
3. By submitting ticket through portal as guest user (when web portal is enabled)
4. Admin can add customer from their account

After customer arrives in zaidesk database, then if activation email is enabled in Customers settings then an automatic activation email is sent to customer through which customer can set up his credentials to log into his customer portal. If this is disabled then agent can send activation email on clicking the [Send Activation Notification] button in that customer view page