All of us, at some point, would have got a doubt about AC & DC. To put it in simple words, Alternating current (AC) is defined as the flow of charges that change direction periodically, and Direct current (DC) has a unidirectional flow of charges and remains the same as long as terminals connected are not changed.
Received the product in very good packaging, also the way it was inside it seems they test the display before shipping which is a great thing ensuring defective piece doesn't get delivered! Very fast delivery. Highly recommended!