json.Unmarshal vs json.NewDecoder.Decode: what's the difference in Go?

Hi everyone! I'm new to Go and trying to understand JSON parsing. I see that the standard library has two ways: `json.Unmarshal` and `json.NewDecoder().Decode()`. Both seem to do the same thing — convert JSON into a Go data structure. But I don't understand when to use which. For example, I have this code: ```go type User struct { Name string `json:"name"` Age int `json:"age"` } // Method 1 data := `{"name":"Alice","age":30}` var user1 User err := json.Unmarshal([]byte(data), &user1) // Method 2 reader := strings.NewReader(data) var user2 User err = json.NewDecoder(reader).Decode(&user2) ``` Both options work the same way. But I've heard that `Decoder` is better for streams, and `Unmarshal` is for small data. What's the real difference? Is there a difference