WhatsApp is an instant messaging app and Messages is an SMS and MMS text messaging platform. WhatsApp allows users to send messages, photos, videos and audio recordings over the internet, while Messages are sent over a cellular connection. WhatsApp messages are sent and received instantly, while Messages may take a few seconds or minutes to be delivered. WhatsApp also offers the ability to make audio and video calls, while Messages does not. Additionally, WhatsApp offers end-to-end encryption which Messages does not.