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Firstly, What is GD Library, and why we need to installed it on our hosting, what so important of this GD Library? I will give you an anwser one by one!

What is the GD library?
According to GD lib official website: http://www.libgd.org,
GD is an open source code library for the dynamic creation of images by programmers. GD creates PNG, JPEG and GIF images, among other formats. GD is commonly used to generate charts, graphics, thumbnails, and most anything else, on the fly. While not restricted to use on the web, the most common applications of GD involve web site development.

GD is written in C and various binding are available. See a non exaustive list here .

GD Library usage
GD is often used in various web applications. Integrated in the latest PHP version- PHP5, GD not only expands the potentialities of PHP as far as the creation of HTML output is concerned, but also enables the users to create and manipulate images in different formats, including GIF, PNG, JPG, WBMP and XPM. Moreover, thanks to the GD library, PHP can output image streams directly to a browser.

How to check if GD library is enable
We will try some steps here to identify GD support is enabled or not. Mostly PHP 4 and higher versions comes with GD support. Some time it may not be enabled. To know this we can use phpinfo function and check GD support is available or not.

<?php
phpinfo();
?>

Here is an image of what phpinfo function displays in a GD enabled system.

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