WhatsApp is just about the most important app on my phone; it's what I use to talk to my friends and family, interact with PR folks, and connect with businesses to get more details on a product. While it isn't as widely used in North America, it is an essential part of life in India, and I don't know anybody who doesn't use the service daily.
When you use WhatsApp on Android, all the data that you accumulate on the service — including chats, images, and videos — gets backed up to Google Drive should you wish to enable the feature. Doing this allows you to seamlessly transfer between phones without losing any chat-related data, and as someone who switches between devices bi-weekly, this is a feature that's integral to how I use a phone.
