It's called type-in domains. Common words, phrases, stuff like that. If you don't quite understand, watch an elderly person use the internet. I watch my father. When he wants to get a muffler for his corvette, he sits down and types muffler.com, and then goes on a clicking frenzy, clicking everything that comes up. On a related note, I recently bought him an apple, as he could destroy a pc beyond repair in about 3 days. Want to save money? Stay away from domains commonly used by the internet savvy. For example, nameproos.com would be a bad typo. Anyone going to namepros.com knows what a parked domain looks like. The less internet savvy the sites target audience is, the better.
also look for previously registered and used domains. more likely they got picked up by search engines and more likely they would have traffic. You can use domaintools.com (domain suggestion section) to find out if domain is previously registered. Try estibot.com tools to find drops that may worth something.
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