Registering a domain that mimics a popular site through common typos—one letter off, swapped chars, missing hyphen, .net instead of .com. The goal is usually phishing, malware distribution, or ad revenue from misdirected traffic.
Typosquatting is cheap and effective because humans are sloppy. A user rushes, fat-fingers the URL, hits enter. You own the misspelling. They land on your site instead of their bank, social network, or email provider. From there, credential theft, drive-by malware, or a lookalike login form are standard plays.
Legally, typosquatting occupies gray territory. UDRP and URS can squash obvious cases (especially if the typo domain is used maliciously), but registering misspellings of generic terms is harder to challenge. If you register "goggle.com" instead of "google.com" and park ads, Google has remedies. If you register "techstartup-typo.io" and no one famous owns it yet, you're mostly safe—until they do and sue.
Bunkerdomains doesn't stop you from registering typo domains. We also won't hand your details over when a cease-and-desist arrives. That's your legal problem to solve or ignore.