Defensive registration

Why it matters

A brand may register its name in other extensions and common misspellings so others cannot use them. It helps stop confusion and phishing. It also costs renewals every year, so choose with care. Not every variation is worth holding. A broad list can become expensive. A common mistake is trying to register every possible name. Focus on the likely typos and the extensions your customers use. Defensive registration is for new, unregistered names. For names already owned by others, a defensive acquisition or legal action may be needed.

Source: sullysblog.com