Trademark Infringement:Trademark infringement occurs when one party uses a trademark that is identical or confusingly similar to a trademark owned by another party, without the permission of the trademark owner.
Likelihood of Confusion:The central issue in trademark infringement cases, which examines whether consumers are likely to be confused by the similarity between the two marks and associate the infringing mark with the trademark owner.
Polaroid Factors: A set of factors established in the Polaroid v. Polarad case to determine the likelihood of consumer confusion, including the strength of the mark, the similarity of the marks, the proximity of the products, the likelihood of the senior user to bridge the gap, actual confusion, the defendant's good faith, the quality of the defendant's product, and the sophistication of the buyers.