what does mysqli_fetch_assoc do in php code example

Example 1: mysqli_fetch_assoc

<?php
	/* Connect to your database */
	$con = mysqli_query("hostname", "username", "pwd", "database");
    /* Select Columns from table*/
    $sql = "SELECT * FROM `TABLE`";
    /* Query your SQL code to SQLDatabase */
    $result = mysqli_query($con, $sql);
    /* Find rows in table*/
    $check = mysqli_num_rows($result);
    if($check > 0){
    while($data= mysqli_fetch_assoc($result)){
    /* Print all of your data*/
    echo $data["ColName"];
    }
    }
?>

Example 2: mysqli fetch assoc

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if ($mysqli->connect_errno) {
    printf("Connect failed: %s\n", $mysqli->connect_error);
    exit();
}

$query = "SELECT Name, CountryCode FROM City ORDER by ID DESC LIMIT 50,5";

if ($result = $mysqli->query($query)) {

    /* fetch associative array */
    while ($row = $result->fetch_assoc()) {
        printf ("%s (%s)\n", $row["Name"], $row["CountryCode"]);
    }

    /* free result set */
    $result->free();
}

/* close connection */
$mysqli->close();
?>