What is a US Treasury Bond and where can I apply for one?

"A Treasury Bond is a way for the US federal government to manage its debt. They are issued directly but the US government, and sold to anyone interested in buying them. By buying them, you are, essentially, loaning your money to the US government. When the bond matures, the government pays you back the amount they borrowed, plus a guaranteed interest amount. They are among the safest way to invest your money."