The main difference between a WhatsApp call and a normal call is the technology used. A WhatsApp call uses Voice over Internet Protocol (VoIP) technology, which allows users to make calls using the internet instead of via traditional phone lines. This means that it is much cheaper than making a regular voice call, since data rates are typically lower than mobile calling plans. Additionally, WhatsApp calls usually have better sound quality because they use more efficient compression formats. Finally, you can also send messages while on a Whatsapp video or audio call, allowing for more dynamic conversations than traditional phone calls.