Browser hijackers, such as Track Click Crystal essentially function as marketing tools catering to the online advertising industry. They're designed to showcase various products, services, and promotions on users' screens while they browse the web. All those intrusive pop-ups, ads, message boxes, and hyperlinks that seem to bombard you from every corner of your screen are, in fact, sponsored advertisements. The developers associated with browser hijackers like Track Click Crystal and similar software earn money every time you view or engage with these ads. This typically happens through Pay-Per-Click or Pay-Per-View models, which are prevalent strategies in the online advertising world.