Which is better, a CD or a treasury bill?

Can you help me understand the difference between a Certificate of Deposit (CD) and a Treasury Bill, and which one might be the better investment option for me? I'm looking for a low-risk, steady return on my savings, and I'm not sure which of these options aligns best with my goals. Can you provide some insight into the features and benefits of each, as well as any potential drawbacks I should be aware of?