Definition: a sales call with no introduction; an unannounced sales visit
Examples:
I want to start selling to XYZ Company. However, I don’t know anyone there. I tried to get an introduction, but none of my friends know anyone, either. I will just have to give them a cold call.
It is hard to sell something when the customer doesn’t know you. If you have an introduction, that is better. Cold calling rarely works well.