gistfile1.php

<?php
    // Use WP_User_Query to grab an array of user IDs.
    $user_query = new WP_User_Query( array(
        'fields' => 'ID'
    ) );
    $user_ids = $user_query->get_results();
    
    // Loop through each user ID.
    foreach( $user_ids as $user_id ) {
        // Use get_userdata() to get a user object with info stored in the 'user' database table.
        $user_object = get_userdata( $user_id );
        echo
            get_avatar( $user_id )
            . '<h1>'
            . $user_object->display_name
            . '</h1>'
            . '<div class="biography">'
            // Use get_user_meta() to grab individual bits of data stored in the 'usermeta' database table.
            . get_user_meta( $user_id, 'description', true )
            . '</div>'
        ;
    }
?>

This was written as an example for my blog post: http://blog.shaunscovil.com/post/55272793162/the-difference-between-get-user-meta-and-get-userdata