Also known as perfection. A UCC concept relating to a security interest in collateral provided by a debtor to secure performance of obligations in favor of a creditor. In order for a creditor to enforce its rights against the debtor and the collateral vis-à-vis third parties, the creditor must have perfected its security interest in the collateral under the UCC. To be perfected, the creditor must satisfy certain requirements set out in the UCC which depend on the type of collateral. For example, filing a UCC-1 in the appropriate filing office of the debtor will typically perfect the creditor's security interest for most types of collateral.

For further information, see Practice Note, UCC Creation, Perfection, and Priority of Security Interests.