Trademark infringement is unauthorized use of a mark in a way that is likely to confuse consumers about source, sponsorship, or affiliation.
Why trademark infringement matters
Trademark infringement matters because trademarks help consumers identify where goods or services come from. Infringing use can harm brand identity, consumer trust, licensing value, and marketplace clarity.
The central question is often likelihood of confusion rather than whether two marks are identical.
Where trademark infringement appears
Trademark infringement appears in cease-and-desist letters, brand-clearance reviews, marketplace takedowns, domain-name disputes, advertising disputes, settlement agreements, and federal lawsuits.
Practical example
A new business uses a logo and name very similar to an existing brand for similar services. If consumers are likely to think the businesses are connected, trademark infringement may be alleged.
How trademark infringement differs from nearby terms
Trademark infringement differs from trademark dilution because infringement focuses on consumer confusion. Dilution may protect famous marks against blurring or tarnishment even without ordinary confusion.
Related terms
Quick knowledge check
Why can trademark infringement exist even when two marks are not exactly identical?