Quick Scoop

DAO in Java means Data Access Object. It is a design pattern that separates database/data-storage code from the rest of your application logic, so your business code stays cleaner and easier to maintain.

What it does

A DAO usually handles CRUD operations:

  • Create
  • Read
  • Update
  • Delete

It acts like an abstraction layer between your app and the database, hiding SQL or persistence details from service classes.

Why it matters

Using DAO helps you:

  • Keep database code in one place.
  • Reduce coupling between layers.
  • Make code easier to test and change.
  • Swap the underlying storage more easily later.

Simple example

If you have a UserDao, your service code might call methods like getUser(), saveUser(), or deleteUser() instead of writing SQL directly everywhere. That makes the app easier to read and refactor.

Tiny definition

DAO = a Java pattern for isolating data access from business logic.

If you want, I can also show a simple Java DAO example with code.