WHMCS is a client management, billing, and client support system online application or software that is used for online businesses. WHMCS provides some automation systems that are very important for online businesses. WHMCS is most widely used in web hosting businesses. Not only that, WHMCS is one of the most widely used web hosting client management, billing, and client support software today. Some of the benefits of WHMCS are client management, billing, client support domain registration system and management client automatic invoices, billing reminder hosting and domain order system product, service ordering, and many more features.