What are DAO, MB, TO, SERVICE, MODEL, CONVERTER and HELPER classes? [closed]

My answer is not complete, but I believe it will help. There are nomenclatures that are probably only used by your company, the ones I know are:

DAO - Data Access Object. Basically it is the object that abstracts everything that is referring to the access to data of the application. MODEL - Probably related to MVC, Model View Controller, Model or Model in your case is the object and its characteristics, a form of registration form has:
string Email{get;set;}
string ConfirmaçãoEmail{get;set;}
string Nome{get;set;}
string Senha{get;set;}