With the exif extension you are able to work with image meta data. For example, you may use exif functions to read meta data of pictures taken from digital cameras by working with information stored in the headers of the JPEG images.

Enabled EXIF in PHP is not necessary, except that you wish to use meta data as image description for bulk uploading pictures. Windows users must also have the mbstring extension enabled.

To check if you have EXIF enabled, use the phpinfo() function. Or if you already have the One Admin files uploaded to your web server, you can access the URL http://your_domain.com/oneadmin/phpinfo.php with your browser.

Below are the screen shots to show that you have the required EXIF running.