Is there any way by which we can display some products to specific customers only.
No one else can see that product or search it ?
There is no access control for catalog content if that is what you mean. Depending on the exact requirements perhaps the market concept is a way forward. Otherwise you'd have to create your own filtering, e.g. by using a property on your content model to somehow define the target audiences and the implement your templates to filter by this property.
Ok, @Magnus Thanks for your guidance.....