Where can I buy 1 year Treasury yield?

Could you please elaborate on where one might purchase a 1-year Treasury yield? I'm curious about the different platforms or marketplaces that offer this type of investment, and how I could go about acquiring it. Is it typically done through a brokerage account, or are there other options available? I'm looking to invest in something with a relatively low risk and steady return, and the 1-year Treasury yield seems like a good fit. However, I'm not entirely sure where to start my search.