The two disciplines share some skills, but they're built around different goals, and confusing them tends to produce sales letters that read more like articles than persuasive copy.
Content Writing Informs; Copywriting Persuades
An article aims to educate or entertain, while a sales letter exists specifically to move the reader toward a decision.
Copywriting Is Built Around a Single Action
Every element of a sales letter should ladder up toward the one action you want the reader to take, unlike broader content that can serve multiple purposes.
Recognizing the Difference Improves Both
Understanding when you're writing to persuade versus writing to inform helps you choose the right structure, tone, and length for each task.
Next step: Use the Sales Letter Writer to draft persuasive, action-oriented copy rather than general informational content.