How can I install whatsapp on my ipad air (wifi cellular)

I have a ipad air. Wants to install whatsapp for chatting with friends.
Pl confirm whether ipad air supports whatsapp and from where to download, as it is not in playstore

First, WhatsApp decides if they want to make the app compatible with iPad, not Apple. If you have a problem with that, talk to them.
Second, no, the iPad is not a phone so you can't regular voice calls. You can use other VOIP services like Skype.
I'm curious, if you needed to text and make voice calls, don't you think an iPhone would have been a better choice than an iPad?