What are the differences between Unsecured and Secured NCD?

What are the differences between Unsecured and Secured NCD?

Secured NCD:

These are backed by company assets
In case of default, company assets can be liquidated to repay investors
Offers lower returns than unsecured NCDs
Less risky than unsecured NCDs

Unsecured NCD:

These are not backed by company assets
In case of default, investors cannot reclaim money through asset liquidation
Offers higher returns than secured NCDs
Riskier than secured NCDs