First Click Attribution is a marketing measurement model that assigns all credit for a conversion to the first touchpoint a customer interacts with. This means that if a potential customer clicks on an advertisement or link before making a purchase, that initial interaction is considered the most significant in driving the sale. This model helps businesses understand which channels, such as social media, email marketing, or search engine ads, are most effective in attracting new customers. By focusing on the first click, companies can optimize their marketing strategies to enhance customer acquisition efforts.