Real-time data allows us to observe activity as it going on our site or application. The reports are updated continuously in real-time or each hit is reported within seconds after it occurs on the website. For example, we can see how many people are on our site currently or right now, which pages they are visiting and which type of conversation they fulfill.
To see the real-time data we just need to sign in own google analytics account and navigate on the repost and just click on the real-time. This will show all real-time data like how many visitors are there on the website right now and other many different types of data.
If we see no data in real-time it means that at the current time no user activity on our website.