How can I communicate with customer in quotation

hello everyone
I have a project about ERPNext and I confuse about quotation

look at this:

ERPNext helps its users to track opportunities from customers or leads, send them quotations and make a confirmed sales order.

the question is how can I send the quotation to the customers?

I already know to create quotation and sales order but how to communicate with customer or supplier inside the system?

Is it by printing the quotation to them? I guess this

@A.S, do you need setup a email account in the system, and Sent the Quotation by email. to start a discussion with the customer!