What is data, anyway?
Data is the fuel that powers your device's access to the internet. When you're doing anything on your phone to do with the internet - sending and receiving WhatsApp messages, checking Facebook, using Google Maps, sending an email, and so on - you are using data.
Data is measured in megabytes, or MB and gigabytes - 'gigs' or GB.
How much data do I need?
That depends on your usage.
If you're a light user, who uses your phone to check email, WhatsApp and Facebook, for example, without downloading anything, you probably won't need more than about 250MB of data per month. If you received 100 emails in a month and spent about 10 minutes a day on WhatsApp, you'd probably use about 175MB of data per month.
But, if you're a heavier user, who often downloads or stream music or videos, or if you often take and share photos or videos on social media, you are likely to use way more data. With 500MB, you can watch about an hour of low-res video, download (or upload) 44 photos and about 12 songs. Which isn't very much at all.
But luckily you don't have to leave it up to guesswork. Vodacom has a handy data calculator that will help you to predict the amount of data you'll need on your phone in any given mon...