Usernames are typically set with a security level or privilege level. If not set, it defaults to 1 which is the lowest. Using the username and password for a user at level 1 is enough to achieve the ">" prompt. At level set at 15 will bring a user to the "#" or "enable" prompt. Typically users are set to a level lower than 15. Then upon logging in, they use the enable password to get to the enable prompt.
Enable secret and enable password are pretty much the same thing. Enable password sets the password in plain text on the config, whereas enable secret encrypts it. They both get you to the same prompt.
