There are 3 WhatsApp application types:

• Whatsapp personal: any person with a mobile phone number that accepts and follows WhatsApp's policies can use the WhatsApp application.
  

• Whatsapp Business: any company with a mobile phone number that accepts and follows WhatsApp policies can use the Whatsapp Business application. WhatsApp Business was built with the small business owner in mind. Create a catalog to showcase your products and services. Connect with your customers easily by using tools to automate, sort, and quickly respond to messages.
  

• WhatsApp Business API (WABA): any company with a mobile phone number or landline, that meets the WhatsApp approved business types, can request a WhatsApp API verified number through a WhatsApp approved Business Solution Provider. With WhatsApp API your company can integrate communications with other software like CRM, ERP, etc., and generate automated workflows with the data.
  WABA is designed for medium and large businesses, WhatsApp Application Programming Interface (API)  powers your communication with customers all over the world.