standardUserDefaults

`UserDefaults` is a simple key-value persistent data store provided by Apple for macOS, iOS, watchOS, and tvOS. It is primarily used for storing small amounts of application-specific data, such as user preferences, settings, or simple state information.

The `UserDefaults` object acts as a central repository for these preferences. You can store various data types, including Booleans, integers, floating-point numbers, strings, dates, arrays, and dictionaries, as long as they conform to the `NSCoding` protocol. Data is stored using string keys, allowing you to retrieve it later by the same key.

To use `UserDefaults`, you typically access a shared instance of the `UserDefaults` class. You can then use methods like `set(_:forKey:)` to store data and `object(forKey:)` or type-specific accessors like `string(forKey:)` to retrieve it. For example, to store a username, you might use `UserDefaults.standard.set("JohnDoe", forKey: "username")`. Later, you could retrieve it with `let username = UserDefaults.standard.string(forKey: "username")`.

It's important to note that `UserDefaults` is not intended for storing large amounts of data, sensitive information, or complex data structures. For such purposes, other storage mechanisms like Core Data, Realm, or file system storage are more appropriate. `UserDefaults` data is stored in an unencrypted format, making it unsuitable for private or security-critical information.

When an application is uninstalled, its `UserDefaults` data is also deleted. Changes made to `UserDefaults` are not always immediately persistent; they are typically written to disk periodically. However, for most typical use cases of storing user preferences, `UserDefaults` provides a convenient and straightforward solution.