IPA: /ˈæd.vəˌtaɪ.zər/
KK: /ˈæd.vɚˌtaɪ.zɚ/
A person or company that promotes products or services to attract customers.
The advertiser created a compelling campaign to promote the new product.
Advertiser → It is formed from "ad-" (meaning to) and "vertere" (meaning to turn). The word refers to someone who turns attention to something, typically for the purpose of promoting or selling.
Think of someone who 'turns' attention 'to' a product or service — that's what an advertiser does.