different between crm vs indexphp

crm

crm From the web:

• what crm stand for
• what crm means
• what crm does amazon use
• what crm software
• what crm does keller williams use
• what crm does exp realty use
• what crm does apple use
• what crm does walmart use

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indexphp

indexphp From the web:

• what's index.php
• what is index.php file
• what is index.php in wordpress
• what is index in phpmyadmin
• what is index.php page
• what is index.php in codeigniter