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There are two kinds of properties.
The first kind is *data properties*. We already know how to work with them. All properties that we've been using till now were data properties.
The first kind is *data properties*. We already know how to work with them. All properties that we've been using until now were data properties.
The second type of properties is something new. It's *accessor properties*. They are essentially functions that work on getting and setting a value, but look like regular properties to an external code.
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## Using for compatibility
One of the great uses of accessors -- they allow to take control over a "regular" data property at any moment by replacing it with getter and setter and tweak its behavior.
One of the great uses of accessors is that they allow to take control over a "regular" data property at any moment by replacing it with a getter and a setter and tweak its behavior.
Imagine, we started implementing user objects using data properties `name` and `age`:
Imagine we started implementing user objects using data properties `name` and `age`:
```js
function User(name, age) {