What is the role of the empty interface in the Go language and in what cases is it used?

In Go, the empty interface interface{} is an interface that contains no methods. It can hold a value of any type because all types implement the empty interface by default.

The empty interface is used in the following cases:

• To store values of different types in a single variable, for example, in slices or maps.
• In functions that should accept arguments of any type (similar to generic parameters).
• When working with dynamic data, such as parsing JSON, where the data structure is unknown in advance.

Example:

var data interface{}
data = 42
fmt.Println(data) // 42
data = "string"
fmt.Println(data) // string

Thus, the empty interface provides flexibility, allowing working with data without strict typing.