why we return response responseentity spring code example

Example 1: responseentity object

package com.zetcode.controller;

import com.zetcode.bean.Country;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class MyController {
    
    @RequestMapping(value = "/getCountry")
    public ResponseEntity<Country> getCountry() {
        
        var c = new Country();
        c.setName("France");
        c.setPopulation(66984000);
        
        var headers = new HttpHeaders();
        headers.add("Responded", "MyController");
        
        return ResponseEntity.accepted().headers(headers).body(c);
    }
    
    @RequestMapping(value = "/getCountry2")
    @ResponseBody
    public Country getCountry2() {
        
        var c = new Country();
        c.setName("France");
        c.setPopulation(66984000);
        
        return c;
    }    
}

Example 2: responseentity object

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
            http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.zetcode</groupId>
    <artifactId>responseentityex</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    
</project>