사인 & 도장
사인, 도장, both words refer the "seal", but 사인 is the private seal, and 도장 for the company one?

Is this correct?

Question

사인 & 도장
사인, 도장, both words refer the "seal", but 사인 is the private seal, and 도장 for the company one?

Is this correct?

Answer

사인 means "signature"
도장 means "(general) seal" 
직인 means "official or company's seal"
관인 means "government seal"