A trademark is not a document a government hands you; it is a reputation the market builds around a symbol, and U.S. law tracks that reputation from cradle to grave. This article follows a mark through its full arc: conception (what the law counts as a mark), birth (rights that arise from bona fide use in commerce), the strengthening years (distinctiveness on the Abercrombie spectrum, clearance, federal registration, and incontestability), the hazards of maturity (infringement, dilution, and cybersquatting), and the three self-inflicted ways owners kill their own marks—abandonment, naked licensing, and genericide. It is grounded throughout in the Lanham Act, 15 U.S.C. sections 1051 to 1141n, and the cases that construe it, from Abercrombie and Two Pesos through Booking.com, Romag, Hana Financial, and Jack Daniel's. Written as a research resource for founders, in-house teams, litigators, and curious generalists who want the doctrine and the practical stakes in one place.