This is a follow-up to a previous question. Any time you provide an interviewer with the answer, you should anticipate a follow-up question. This indicates that they either need more information or have a specific interest in this topic. If there are several follow-up questions about the same topic, they indicate that the subject is important to their operations. You should use it as a clue to talk more about the subject when answering their questions. Your answer to this question may sound something like this: "There are four basic types of JDBC drivers. The drivers work in conjunction with the JDBC API to connect with and extract information from databases. The four drivers are ODBC, Native API, Pure Java driver for Database Middleware, and Direct-to-Database Pure Java Driver."