Communication can be done using verbal, gesture or written word. Communications skills are taught in schools worldwide. This is because they are the key for a successful business transaction.
For quite a long time people have thought that communication skills are applicable only to the seller and not to the buyer. In my view, I think the sword cuts both ends. A buyer also has to communicate in a comprehendible and polite manner.
It is wise to treat others as you would like to be treated if you were in their position.