In Cloud Computing, generally Database is provided by the Service providers only..
Tables in SQL are Objects in Salesforce.
We develop Visual Force pages in Salesforce and we will control the pages with the help of controllers coded in Apex.
Apex is an in-house technology as well as language, which is a subset of Java.
It inherits all the OOPS concepts of Java.
So, we can conclude that
Model : Objects
View : Visual Force Pages
Controller : Apex classes