A common attack is to register domains similar to existing ones to capture misdirected traffic, and serve malware or ads. Cosmic rays routinely flip bits in br

A common attack is to register domains similar to existing ones to capture misdirected traffic, and serve malware or ads. Cosmic rays routinely flip bits in browsers' memories at the moment of request, causing the URL to change by one symbol. To defend against this, big companies typically register a bunch of domains that are slight mutations of their primary business (redirecting to it).