The traffic source refers to the origin of how people found your website.
Top-selling products are extremely popular items that the company sells in larger quantities than products from other brands.
The trial period is the duration of time companies give to their clients to test the product for free.
A target audience is a specific group of people who are likely to buy a product and become customers.
A tracking link is a URL with appended tags – or parameters – that can be used to indicate which channel