Trademark questions!!?

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I really do not understand it at all!?
What do you do when you check to see whether a word is trademarked or not?
I mean, how can common term even be trademarked? I saw someone mention the site brandbucket, so I went to that site, and I saw a brand call Reactly, then, I was curious, so I went to uspto.gov/trademarks/ and did a quick search on the word "react" and it actually returned a list of result!? so really, am I missing something here? so we can actually use trademarked words? (I mean, I bet that person probably did some research on trademarks before making that brand/ logo, right? so now, I am really confused. Could someone please explain to me, what do you do, when you check for trademarked word? and how come, people are allowed to trademark common word, such as "react", and how come people can use the trademarked word" react" for their brand?????

 

[Name Trader]

Just as long as you use the domain in a way that doesn't infringe on any trademark, you can do so. You could use a domain with the word "apple" provided you weren't in the business of computers, phones etc. So AppleCleaners.com would have no problems unless "apple" was trademarked for using in the cleaning industry. I didn't check. It's just an example.

Where a domainer usually comes unstuck is they park domains which has trademarked words, and the parking company then places adds on the parking page for either the trademark owner (because it is popular) or for it's competitiors. That's infringing on the trademark owners rights. Then they get taken to UDRP and get branded as a cyber-squatter, or worse, if the trademark owner is really vindictive they take you to court, where the penalties are up to $100,000 per infringement.