This is the 416th most frequent Korean word.
판매
Sale
'판매' in this usage refers specifically to the act of selling as part of a promotional activity where discounts are applied.
특별 행사 동안, 그들은 많은 상품을 할인 판매했습니다.
During the special event, they sold many products at a discount.
Here, '판매' is used to mean 'selling' products in a commercial context.
이 가게는 다양한 제품을 판매합니다.
This store sells various products.
In this sentence, '판매' refers to the concept of 'sales' generally, emphasizing the medium through which it's conducted.