Software-defined infrastructure (SDI) is the definition of technical computing infrastructure entirely under the control of software with no operator or human intervention. It operates independent of any hardware-specific dependencies and are programmatically extensible.
This probably means that your browser has saved your username and password into the browser's password manager. This usually occurs the first time you enter your username and password into a new website. The browser will detect this and request to save this information into the password manager. If you agree to do so it will save it and automatically enter this information when opening the site in the future.
