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What is difference between #value and #markup?

I had gone through drupal link which contains something as shown below
https://drupal.org/node/224333

Use ‘#markup’ not ‘#value’ for markup

(Issue) The new default type for items in forms or other structured array data (e.g. node content) passed to drupal_render() is ‘#type’ => ‘markup’. In Drupal 6 and earlier, the HTML content was added to the array using the #value attribute. In Drupal 7, this needs to be changed to #markup. This change also applies to those form elements of ‘#type’ => ‘item’. This change reduces the confusion between form values and markup and allows the code in drupal_render() to be simplified.

Example 1, from system.admin.inc In Drupal 6:

<?php   $screenshot = $screenshot ? theme('image', $screenshot, t('Screenshot for %theme theme', array('%theme' => $theme->info['name'])), '', array('class' => 'screenshot'), FALSE) : t('no screenshot');    $form[$theme->name]['screenshot'] = array('#value' => $screenshot); ?>

In Drupal 7:

<?php   $screenshot = $screenshot ? theme('image', array('path' => $screenshot, 'alt' => t('Screenshot for %theme theme', array('%theme' => $theme->info['name'])), 'attributes' => array('class' => 'screenshot'))) : t('no screenshot');    $form[$theme->name]['screenshot'] = array('#markup' => $screenshot); ?>

I have a code in drupal 6 which is as shown below : 

$form['in_title'] = array(   '#type' => 'button',   '#value' => t('ort'),   '#executes_submit_callback' => false,   '#attributes' => array('class' => 'hide-submit-exclude'), );

I want to convert this code to D7 .
So When and where should I use #markup and #value ?
I just want to know the difference between #markup and #value

This article was republished from its original source.
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What is difference between #value and #markup?

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