Interpretation of the Hosting Plan Parameters
Antivirus Software means protection at the server level against mail containing malicious code which may affect the mail client. It is optional, that is why it shall be enabled by the customer on their own.
SSI means directives which may be inserted in an HTML document in order to execute other programs or obtain data. They will free you from the necessity to write complete CGI programs in order to display small dynamically updated documents.
SSL means a data link layer protocol which offers a secure channel for data transmission between the client and the server using authentication, digital signatures and encryption. Traffic shall be encrypted / decrypted with the help of the key the client receives from the server.
Databases means SQL Relational Databases which make it possible to structure data storage and organize links therein, as well as parallelize access thereto in the event of simultaneous access. Having a necessary number and type of databases you will have less trouble organizing your web applications.