Comparison
Quick answer
Trademarks protect your brand identity — names, logos, and slogans in the marketplace. Copyright protects original creative works — writing, code, art, and music. Copyright is automatic upon creation; trademark must be registered to get full protection. Most businesses need both, but they protect different things.
Most businesses need both — trademark for their brand identity, copyright for their creative output. Trademark is more actively useful for companies building a brand in a market; copyright is most valuable for creators and publishers. Start with a trademark search before launching any brand name — it is one of the cheapest and most important legal steps a new company can take.