SSH is a secure protocol for exchanging data between two network hosts. It is most used by system administrators and developers (Ruby on Rails and others). Usually admins remotely access the server to configure/update software, setup permissions, monitor server performance and other admin related tasks. Bluehost allows SSH access, but first you need to enable it. You can do this by following the steps in this article: http://helpdesk.bluehost.com/index.php/kb/article/000180 . With SSH enabled you can use a SSH client software to connect to your Bluehost server. Best clients are Putty(windows OS) and OpenSSH client (linux). Once you login with SSH you can perform tasks such as creating files, folders, backing up mysql databases, view/terminate processes started by your user account and other tasks. Probably you will never need SSH access to your bluehost account, but is good to know that Bluehost allows SSH.