Pixel is a snippet of code that is located on the affiliate link or on the pages where sales or transactions are generated. When a user clicks somewhere around the pixel, it is fired, meaning the click ID, sale, or transaction is generated. Consequently, marketers can track or receive notifications when the affiliate link was followed or a sale/transaction happened.
Top-Level Domain (TLD)
A Top-Level Domain is a part of the domain name that follows immediately after the root domain. TLD is the starting point (right to left)